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How could you yield those 100USD in that way? What I can think is that a person who has 100usd is that he bets 1usd and that 1usd lasts at least 2 minutes, it can be a bet with poker games or a roulette and those games are sometimes very fast. a game of poker against the machine or computer is something that can happen very quickly, I say this from my own experience, always a hand of poker does not spend 1 usd either, you can spend 100usd, this can result for slots that I have no experience , but if you bet with less than 1USD it could be, but I think that a slot machine the chances of winning are slim.
They are not scarce, it is what it is: RTP + Bonus + stake or size of your bet, usually they range from $0.2 (+) + volatility, the slots are so popular because the multipliers give you profit or put you equal or decrease the losses, in any case you can add the wager, rakeback, etc. that compensates.
In any game, the long term rules and it is the best bet to make a profit, the chances of winning are always scarce, that is the "game" in reality that must be beaten with the data that each game provides us and the management of the bankroll.