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I had some interesting wins around $2k - $2.5k but unfortunately I have never had such spectacular wins.
It's hard to believe that you can win millions if you risk a few dozen cents or a few dollars. But I think this statistic is not about the total amount someone risked, but about the one-time bet that brought him that win. In fact, theoretically, these people could have played for years and lost in the past a much larger amount than they won

Gamblers mostly lose huge amount first before winning incredibly. You’re just too lucky if you only bet for now and then you eventually hit the jackpot, you’re just too lucky that when you start chasing your luck, you end up losing them all and all your profits have eventually returned to the house. And it’s not small bettors but certainly high rollers were able to take the biggest wins, as they also risk huge amount of money hoping to win the jackpot prize.