High volatility slots in Australia — the legal picture, the ACMA’s record, and what a player can reach instead

A punter searching for the best high volatility slots in Australia runs into a wall very quickly. The wall is not editorial preference, and it is not a marketing gap an enterprising offshore casino can fill: it is the Interactive Gambling Act 2001, which makes offering online casino games to anyone in Australia a criminal offence, and which has been enforced hard enough that 1,751 illegal gambling and affiliate marketing websites have been blocked since the first blocking request in November 2019. The page that follows is not a top-ten of offshore brands — those would all be illegal here — but an honest account of what that prohibition looks like, which offshore operators the ACMA has acted against in living memory, what player protection actually exists for an Australian, and where high volatility play of the kind the search implies does happen lawfully: licensed pokies venues, land-based casinos and the self-exclusion register that does cover them.

This article draws on the ACMA’s own enforcement register, the IGA itself, and state-level casino regulators; figures are current as of 28 October 2026 and were checked against the ACMA’s published blocking and warning lists.

Why “best high volatility slots” returns no honest shortlist for an Australian reader

High volatility, as the rest of this page describes it, is a profile of variance: long quiet stretches and the occasional large payout, with the maths working out in the house’s favour over time. What the search implies — a working Australian-facing online casino running those games — does not exist as a licensed product. What does exist is an offshore market that presents itself as if it were licensed, accepts Australian deposits, and has been the subject of formal warnings from the ACMA for years. The rest of this article is built around that gap: the legal frame, the regulator’s record against offshore brands, what that record actually blocks and what it does not, and the lawful alternatives a player in Australia already has.

What high volatility actually means at the reels

The shape of variance on a high volatility slot

A high volatility slot runs long quiet stretches between wins, and pays larger amounts when it does pay. The arithmetic is set by the paytable and the random number generator; the player experience is set by the bankroll. The same slot can feel very different to a player with twenty dollars in the account than to one with two thousand — not because the reels behave differently, but because the silent stretches that are a routine cost on a bigger balance are a session-ender on a smaller one.

That asymmetry is the point of the volatility label. A low volatility slot pays out more often, in smaller amounts; the bankroll lasts longer and the experience is steadier. A high volatility slot pays out less often and pays more when it does; the experience is one of waiting, then a spike. Neither is a better deal in expectation — the house edge is whatever the paytable sets, and it does not change with volatility — but they suit different bankrolls and different temperaments, and a player who treats them as the same game is in for an unpleasant surprise.

Where the house edge lives on a slot

The house edge on a slot is what remains after the published return-to-player percentage. A 96% RTP slot keeps 4% of turnover, on average across a very long run. Volatility changes the shape of that 4% — whether it arrives as a steady drip or a sudden chunk — but the size of it stays the same. A punter chasing a bigger payout on a high volatility title is not paying more to the house than a punter on a steadier title with the same RTP; they are paying it in fewer, larger instalments, with longer gaps between sessions that come out ahead.

Modern video slots can use five or more reels with fifty or more symbols per reel, producing odds as high as 300 million to one against a top combination. A classic three-reel mechanical machine, by contrast, offers roughly 1,000 possible combinations with about ten symbols per reel. The expansion of the symbol space is what allows very large advertised jackpots on modern high volatility titles — and what makes those jackpots extraordinarily rare in practice.

How high volatility slots look in a session

The honest description of a session on a high volatility title is that the player is buying time on the reels with a long losing tail. The paytable says what the top prizes are; the symbol distribution says how rarely they hit; the bankroll says how many spins the player can absorb before something turns up. A player with a bankroll built to absorb a long tail is not “playing smart” — they are simply able to take the ride the game is built to deliver. A player with a smaller bankroll is paying the same edge over fewer spins, which is exactly the situation variance punishes first.

The point is not that high volatility titles are a worse choice. The point is that they are a different choice, and the player who treats the choice as flavour rather than structure tends to leave the session earlier than the maths would suggest.

The Interactive Gambling Act 2001 — what is prohibited and what is not

The scope of the prohibition

The Interactive Gambling Act 2001, strengthened by the Interactive Gambling Amendment Act 2017, makes it an offence to provide online casino games, online pokies or in-play betting to a person in Australia. No state or territory issues a licence for those services. What is licensable is wagering on races and sport placed before the event, lotteries and keno, in practice administered by state regulators and, for online wagering, licensed through the Northern Territory.

That last detail trips a lot of readers up. An online bookmaker accepting an Australian customer will often show a Northern Territory Racing and Wagering Commission licence — Sportsbet, Bet365 and Ladbrokes all sit under it — and the casual reader treats that as “licensed in Australia” without noticing what is and is not licensed. The NTRWC authorises wagering services, not casino games. The commission itself has no full-time staff and meets once a month in Darwin, which is also more or less what one would expect of a body whose job is to process a queue of well-understood corporate applicants.

What the IGA targets

The IGA targets the provider, not the individual player. An Australian who places a wager at an offshore casino is not personally committing an offence under the Act. What they are doing is sending money to a service that has no Australian regulatory cover, which means no Australian complaints body, no recourse if a withdrawal is refused, no obligation on the operator to honour advertised terms, and the live possibility that the site is blocked mid-session with a balance still on it. The Act bites the operator; the absence of regulation bites the player, sometimes harder.

The 2026 advertising reform

The Interactive Gambling Amendment (Gambling Reform) Bill 2026 passed Parliament on 19 August 2026. Its advertising and inducement measures commence 1 January 2027, which means this is law with a start date, not yet in force on a page being read now. The shape of the reform will be visible in a future year’s enforcement record; the substance of it is not yet on the statute book for any reader in 2026.

How the ACMA enforces the prohibition

The blocking tool

The ACMA’s main enforcement lever against offshore operators is the power to direct Australian internet service providers to block illegal sites. A blocking request runs to the ISPs, who then make the site unreachable through standard Australian connections. As of the ACMA’s own reporting in June 2026, 1,751 illegal gambling and affiliate marketing websites had been blocked since the first blocking request in November 2019, and more than 230 unlicensed gambling services had left the Australian market since enforcement was strengthened in 2017.

That figure is cumulative: it counts every site ever blocked, including some that no longer exist. The current round reported at the same time asked ISPs to block 12 more sites — 7Signs, ChromaBet, Donbet, Duospin, Freshbet, Slots Gem, Jacks Club, Lucky Start, Pointsbet, Spinrise, Vinyl Casino and Wildsino — which is the cadence of a regulator working steadily through a long queue rather than running a single dramatic sweep.

The formal warning register

A blocking request is the heaviest tool. Below it sit formal warnings, which the ACMA publishes by operator name and by date. A warning is a public record that the ACMA has identified a service as a prohibited interactive gambling service and notified the operator; the operator is expected to stop offering the service to Australian customers, and the warning sits on the ACMA’s website for anyone to read.

Eleven offshore casino brands are listed later in this article because the ACMA itself has warned the operators behind them. None of those warnings makes the brand safe — a formal warning is what the regulator publishes when a brand has been offering prohibited services, not a clearance — and the brands are presented here because the regulator’s own record puts them on the page, not because any of them is recommended.

What enforcement costs the player

A site the ACMA has blocked is unreachable through standard Australian internet connections at the time of the block. A site the ACMA has warned may still be reachable; the warning is on the regulator’s record, not at the user’s router. Either way, the player has no Australian consumer protection against any of them. The “blocking rate” arithmetic in the section on the regulator’s record is a measure of how often the ACMA has had to use the blocking lever at all — not a measure of how much of the offshore market it has shut down.

What the ACMA has actually blocked — a blocking-rate reading

The inputs to the arithmetic

The ACMA’s own cumulative count, as reported in June 2026, is 1,751 sites blocked since the first blocking request in November 2019. The first blocking request dates a regulator’s blocking tool to a specific start; everything blocked since sits under that start date. The arithmetic that follows takes those two figures as its inputs and produces a band, not a single annual number, because the cadence of enforcement has not been even and a flat average will mislead.

The band the inputs support

Running 1,751 blocked sites across the period from November 2019 to the June 2026 reporting point — roughly 79 months — gives an average of around 22 blocked sites per month, or roughly 265 a year if the cadence had been flat. The cadence has not been flat: enforcement was strengthened in 2017, the first blocking request was issued in November 2019, and the rounds since then have come in waves of a dozen or more, with quieter months in between. The honest reading of the inputs is therefore a band, not a point: somewhere between a low of around 200 sites blocked per year once the early enforcement groundwork is set aside, and a high of around 300 sites per year across the full period from the first blocking request. Either way, the scale of the figure is the point: the regulator is not dealing with a handful of sites. It is dealing with a market.

What the band means for an Australian player

A blocking rate measured in the hundreds per year is a regulator working through a queue. It is not a regulator that has run out of work. For an Australian player, the practical reading is that any offshore casino accepting Australian customers in 2026 is, with very high probability, on the regulator’s radar or has been — and that any of them can be added to a blocking round at any time, mid-session, with whatever balance is sitting on the account at that point. The arithmetic does not tell a player which sites are safe; it tells a player that the category as a whole is under sustained attention, and that the attention does not stop at any particular round.

How an Australian can actually play high volatility slots lawfully

Licensed pokies venues and clubs

The lawful home of high volatility slot-style play in Australia is the pokies venue: pubs and clubs with approved gaming machines, with the rules set by each state and territory regulator. New South Wales had 87,298 pokies-style machines outside casinos as of June 2023; Victoria 26,380 in 2021–22; Queensland 21,122 in October 2023; South Australia 11,672 in September 2023; and the ACT 3,587 in November 2023. That is well over 150,000 approved machines across those five jurisdictions alone, and the national figure sits higher once Western Australia, Tasmania and the Northern Territory are added in.

By 2010 Australia operated an estimated 97,103 gaming machines outside casinos, a per-capita rate about five times that of the United States, and that lead has widened since. New South Wales legalised slot machines in 1956; the cultural and physical footprint of the pokies venue is the largest in the English-speaking world, and the player looking for the high variance experience being searched for already lives closer to it than they may realise.

Land-based casinos and table-game equivalents

For readers looking for a casino floor rather than a venue, Crown Melbourne and The Star in Sydney are the main operators, regulated by the Victorian Gambling and Casino Control Commission (which replaced the VCGLR on 1 July 2022) and by the NSW regulator respectively. The VGCCC’s public log of approved rule changes at Crown Melbourne includes renaming the “Perfect Pairs” blackjack side bet to “Crown Pairs” on 23 December 2024 and introducing a “Free Bet” option with a new “Pot of Gold” side bet on 25 March 2024 — concrete evidence that the regulator is approving, tracking and publishing changes to the table products on offer, which is what licensed casino play looks like in practice.

Under section 66 of the NSW Casino Control Act 1992, a casino operator must not permit a game such as baccarat to be played unless the game and its rules are approved by the regulator, and the operator must make a copy of the approved rules available to patrons on request. The same structure holds in Victoria: the Casino Control Act 1991 requires the VGCCC to approve any rules for table games before they are introduced at the Melbourne casino.

BetStop and the National Self-Exclusion Register

For any player who feels the pokies or the casino floor has become too much, BetStop, the National Self-Exclusion Register, has been live since August 2023. A punter who registers is excluded from Australian-licensed online and phone wagering services for a chosen period. What BetStop does not cover is the offshore casino: an operator that is not licensed in Australia is not connected to the register, and registering with BetStop does not stop an offshore site from accepting a deposit. For someone whose play has already moved offshore, the register is one tool of several rather than the whole answer.

Help lines that do not require a registered service

The National Gambling Helpline, 1800 858 858, is free, 24/7 and includes chat at Gambling Help Online. Neither service depends on the caller being registered with any particular operator, and either will point a player towards financial counselling, self-exclusion and treatment services that do not require the offshore site to cooperate.

The brands the ACMA has warned — what’s actually on the regulator’s record

The brands below are not a ranking and not a recommendation. Each one appears here because the ACMA itself has issued a formal warning about the operator behind it for offering prohibited interactive gambling services to Australians. The “subject support” column reflects only whether research found evidence the brand carries high volatility slots in its public listings; “no-data” means nothing was found, not that the brand does not offer them. The product itself — online casino games, including pokies-style slots, to Australians — is unlawful regardless of any offshore licence the site displays.

What the table is showing is the regulator’s own record. What it is not showing is whether any of the brands offer high volatility slots in particular: the warnings are about prohibited online casino services broadly, not about any one feature of those services. Where research did find a public listing pointing at high volatility content, that is marked in the right-hand column as “listings-only” — meaning the listing exists in the source cited, not that the regulator has anything to say about the game’s variance profile.

The pattern behind the warnings

The same operator names recur across the regulator’s record: Dama N.V. appears four times across four distinct brands over four years (May 2022, March 2025, May 2025, and a separate 2022 warning over Bambet, Dazard, Level Up, Rocketplay, Wild Tornado and Cobra Casinos). Consolutetish S.R.L. appears twice in the same July 2025 round, over National Casino and Bizzo Casino. The pattern is not a coincidence — offshore casino groups commonly operate networks of brands under a single parent licence, and the ACMA’s record reflects that structure rather than picking off operators one at a time. For a player trying to read the regulator’s list, the implication is that a brand being a new name does not mean the operator is new.

Why “no-data” is not “no”

The “no-data” cells in the table reflect what research found in the consulted set, which is the ACMA’s published record and a handful of public listings. An offshore casino will, in practice, offer slots across a range of variance profiles, and high volatility titles are standard catalogue content at most of them. The honest reading is that the absence of a high volatility listing in the consulted sources is not the same as the absence of high volatility content on the site; it is the absence of evidence in the sources this page is built on. The same caveat applies in reverse to the “listings-only” cells — the listings exist, but they are not regulatory findings.

Payments the IGA’s 2024 change shut off — and what is left

Credit cards and crypto for licensed wagering

Credit cards, credit-related products and digital currency have been banned as payment for licensed online wagering in Australia since 11 June 2024, with penalties up to A$247,500 for operators that breach the rule. The legal deposit routes for a licensed Australian wagering account are debit card, bank transfer, PayID/Osko and BPAY. An Australian-facing site asking for a credit card or a crypto deposit is operating outside the Australian rules, which is one more way the offshore casino betrays itself on the payments screen.

Why this matters for an offshore casino

The payment ban applies to Australian-licensed wagering. It does not bind an offshore casino, which will cheerfully accept a credit card or a Bitcoin deposit from an Australian customer. The point is not that an offshore casino cannot process the payment — it can, and does — but that the moment it does, it has separated itself from the Australian regulatory frame in a way the player can see. A punter who wants any of the protections the frame offers cannot use those routes to get them.

Tax, age and the recreational-player position

Minimum age and identity

The minimum age for any gambling product in Australia is 18. Offshore casinos that advertise otherwise are not licensed in Australia; an Australian-facing site that does not enforce the minimum is, again, signalling that it sits outside the regulatory frame rather than inside it.

Tax treatment for recreational players

Gambling winnings of a recreational player are not assessable income in Australia (section 6-5 ITAA 1997) and losses are not deductible, unless the person carries on a business of gambling. The position is summarised as “check with the ATO” rather than asserted as a flat rule, because the edge cases — professional gamblers, poker professionals, syndicate play — are decided case by case and the ATO’s own guidance is the place to confirm any individual situation. What the default position gives a recreational punter is simplicity: a win at a pokies venue or a casino table does not need to be declared, and a loss cannot be claimed against other income.

What a high volatility slot looks like compared with other casino games

The arithmetic of house edge across games

House edge is not the same across casino games. With optimal strategy, blackjack’s house edge is about 0.28% under liberal Las Vegas Strip rules and about 0.43% under Atlantic City rules. Baccarat’s house edge is 1.06% on the Banker bet, 1.24% on the Player bet and 14.36% on the Tie. Craps’ Pass/Come bet carries a house edge of 1.41%, with Don’t Pass/Don’t Come at 1.36% and Any Craps at 11.11%. United States state regulation sets minimum slot machine payout percentages that vary by jurisdiction — Nevada requires at least 75%, Mississippi at least 80%, New Jersey at least 83% — and Australian state regulators set their own equivalent floors for pokies-style machines.

The high volatility slot sits higher up that scale than the table games, generally. The point of the volatility label is not that the house edge is dramatically higher on a high volatility title than on a low volatility one; it is that the same edge is delivered in a different shape — fewer payouts, larger when they come. A punter who knows the table-game numbers and treats a high volatility slot as if it were a 0.28% proposition is misreading the paytable.

Why the volatility profile matters to bankroll

A blackjack player at a 0.28% edge can plan a session around variance and skill. A high volatility slot player is buying variance as the product. The bankroll has to be sized to absorb the silent stretches the volatility profile promises, and the player who treats the bankroll as a session budget rather than as a buffer is the player the volatility profile was designed for — and the one who pays the house edge fastest, because they run out of buffer and stop before the long-run average has anything to say.

The mechanics behind the games — what a player is actually playing on

The reel and the symbol space

Modern video slots can use five or more reels with fifty or more symbols per reel, producing odds as high as 300 million to one against a top combination. The classic three-reel mechanical machine, with about ten symbols per reel, offers roughly 1,000 possible combinations. Charles Fey of San Francisco developed the first automatic slot machine mechanism in the late 19th century — a three-reel machine with five symbols (horseshoes, diamonds, spades, hearts and the Liberty Bell) where three bells in a row paid the top prize of ten nickels.

That expansion of the symbol space, from 1,000 combinations to 300 million, is the engineering behind the modern advertised jackpot. The expansion is also what makes the modern jackpot extraordinarily rare — and what makes the bankroll requirement for chasing it large enough that almost no recreational player actually plays the long-run game.

The history behind the payout

Bally’s “Money Honey,” released in 1963, was the first slot machine with a bottomless hopper and automatic payout of up to 500 coins without an attendant. The first video slot machine was developed in 1976 by Fortune Coin Co. in Kearny Mesa, California. Each of those shifts changed the player’s experience: Money Honey removed the bottleneck of needing an attendant to pay out, the video slot removed the mechanical constraint on reel and symbol design. A player at a modern high volatility title is at the far end of a sixty-year arc that began with a 500-coin ceiling on a three-reel mechanical machine.

What this page is not for, and what to do instead

The honest version of the search

A reader searching for the best high volatility slots in Australia is, on the face of it, looking for an offshore casino that delivers the experience being sought. That is exactly the product the Interactive Gambling Act 2001 prohibits, exactly the product the ACMA has been blocking and warning against for years, and exactly the product that gives an Australian player no consumer protection if the withdrawal fails or the site disappears.

The lawful alternatives

For a high variance slot-style experience, the lawful options are: licensed pokies venues and clubs, of which there are well over 150,000 machines across the states and territories; land-based casinos at Crown Melbourne and The Star Sydney, with regulator-approved table products; and, for anyone whose play has become difficult to manage, BetStop plus the National Gambling Helpline on 1800 858 858.

The page does not recommend any operator on the ACMA’s warning list, and it does not recommend any operator outside that list either, because there is no operator licensed in Australia to offer online casino games. The closest a reader can lawfully come to the experience being sought is a licensed pokies venue or a land-based casino floor.

The cost the offshore option really runs

What the H2 Gambling Capital figure says

The H2 Gambling Capital 2025 report estimates that Australians lose about A$3.9 billion a year to illegal gambling sites, and that the share of gambling going through legal channels fell from 74% in 2021 to 64%. The first figure is a measure of the offshore market’s pull on Australian wallets; the second is a measure of how much of the total gambling spend has migrated away from licensed channels in the years since the IGA’s enforcement was strengthened.

Both figures move in the same direction, and neither is the regulator’s claim alone — the fall from 74% to 64% over four years is the market’s own measurement of the migration, and the A$3.9 billion is the market’s estimate of where the spend has gone. The point of carrying both figures on the same page is that the offshore option is not a marginal curiosity; it is a multi-billion-dollar flow running through operators the ACMA has been blocking at scale.

What the player pays beyond the stake

A player sending money to an offshore casino pays the stake, the advertised house edge, and the absence of any Australian complaint route if the site refuses to pay out. The third item is invisible until it is not — until a withdrawal stalls, until a balance is held “for verification” indefinitely, until a site simply stops responding. The BetStop register cannot help with that, because the operator is not connected to it. The ACMA cannot help with it, because the ACMA’s job is to block the site, not to arbitrate a dispute. The 1800 helpline can listen, but cannot move money.

That is what the A$3.9 billion figure pays for. The experience the punter came for is delivered — sometimes; not always — but the safety net that an Australian-licensed product carries is not delivered at all.

Reading the ACMA’s record as a player

What a formal warning tells a reader

A formal warning on the ACMA’s register tells a reader three things. It tells them the regulator has identified the operator as providing a prohibited interactive gambling service to Australians. It tells them the date the warning was issued, which puts the operator on a public timeline. It tells them the brand(s) covered by the warning, which is not always the same as the operator’s other brands.

It does not tell a reader the warning has changed anything about the operator’s behaviour. A formal warning is what the regulator publishes when the operator has been offering prohibited services; the regulator’s next step, if the operator does not stop, is a blocking request to ISPs, which is the heaviest tool the IGA gives the ACMA. A reader who sees a warning and assumes the regulator has dealt with the brand is reading the wrong end of the regulator’s escalation.

What a blocking request tells a reader

A blocking request tells a reader the regulator has concluded the operator is not responding to warnings, and has asked Australian ISPs to make the site unreachable through standard connections. It does not tell a reader the operator has stopped existing; it tells a reader the operator is no longer reachable from an Australian router by default, which is a different and weaker claim. Offshore operators have been known to surface at new domains, to route around blocks, and to continue accepting deposits from customers willing to find them.

The honest reading of the regulator’s record is therefore not “the ACMA has shut down offshore gambling in Australia” — it has not, and the A$3.9 billion figure is the proof. The honest reading is “the ACMA is enforcing at scale, and the offshore market is responding at scale, and neither side has finished the job.”

What is missing from this page, and why

The detail an honest page cannot supply

This page does not list the RTP of any specific high volatility slot, because none of the offshore operators it touches on is licensed in Australia, and an RTP published by an unlicensed offshore operator is not a fact an Australian player can rely on. It does not list any volatility rating from a specific game, because the same reason applies. It does not list any bonus terms for any of the operators on the ACMA’s warning list, because the only sources for those terms were affiliate marketing pages, which is precisely the channel the IGA’s prohibition targets. It does not recommend any operator, because there is no operator licensed in Australia to recommend.

Each of those absences is deliberate. The detail that would make this page look like a top-ten shortlist — specific RTPs, specific volatility tags, specific bonus terms — would also be the detail that would make this page unlawful under the Act it describes, and the detail that would give an Australian player exactly the wrong impression of which operators are safe.

What the absences cost the reader

The cost is straightforward. A reader who came to this page looking for the offshore casino shortlist implied by the search will leave without one. That is not because the shortlist cannot be built; it can, and several sites have built it. It is because the shortlist, as built, would be a list of operators the ACMA has been warning against for years, and the only honest framing of that list is the one this page uses. A reader who wants the shortlist anyway is welcome to it elsewhere; this page is for the reader who wants the legal picture, the regulator’s record, and the lawful alternatives, and it has tried to give all three.

Frequently asked questions

What does “high volatility” mean for a slot machine?

High volatility describes the shape of variance on a slot: long quiet stretches between wins and larger payouts when wins arrive. The house edge stays the same as on a lower volatility title with the same RTP — what changes is the rhythm of payouts, not the average take. A high volatility game suits a bankroll built to absorb the silent stretches; a low volatility game suits a bankroll that needs to last.

How big are the swings between wins on a high volatility slot compared with a steadier one?

The swings on a high volatility slot can be ten, twenty or more times the average spin cost between one payout and the next, with the occasional large payout as the counterweight. A steadier slot swings less per spin and pays out more often, which makes the session feel less extreme. The arithmetic of expected return is the same in the long run; the lived experience is very different.

Is it legal to play high volatility slots at an online casino from Australia?

No. The Interactive Gambling Act 2001 prohibits offering online casino games to anyone in Australia, and no state or territory licenses them. An Australian-facing online casino accepting deposits for high volatility slots is operating unlawfully, and the ACMA has warned and blocked operators at scale. The individual player is not prosecuted, but has no Australian consumer protection if a withdrawal fails.

Are high volatility pokies-style machines common in Australian pubs and clubs?

Yes. Australia has the largest per-capita footprint of approved pokies-style machines outside casinos in the English-speaking world. New South Wales alone had 87,298 such machines as of June 2023, with Victoria, Queensland, South Australia and the ACT adding tens of thousands more, and the experience a player is looking for is available in licensed venues across the country.

How does the NSW machine count compare with other states?

New South Wales led with 87,298 pokies-style machines outside casinos as of June 2023, more than three times Victoria’s 26,380 (2021–22) and over four times Queensland’s 21,122 (October 2023). South Australia had 11,672 (September 2023) and the ACT 3,587 (November 2023). Across those five jurisdictions the figure runs well over 150,000 machines, and the national figure is higher still once Western Australia, Tasmania and the Northern Territory are added.

Why might a high volatility slot suit a player with a bigger bankroll?

Because a bigger bankroll can absorb the long quiet stretches the volatility profile promises, and is therefore the bankroll most likely to actually reach the larger payouts the game is built around. A smaller bankroll is the buffer the variance profile punishes first — the player runs out of buffer before the long-run average has anything to say, and the house edge is collected over fewer spins than the maths would suggest.