Your point is not unreasonable. Because we know that people who spend more time in gambling they will have the provability to loss in gambling more. But we cannot be sure that a rich or poor person spends more time in gambling. We know that if a rich person wants he can withdraw profits from there by betting more in a short period of time, but for a small amount of money, a poor gambler spends more time in gambling. In that case the gambling amount of rich person will increase and if so then there is a comparatively poor gambler to lose more. I often see that a poor gambler loses more than a rich one. Although his amount of money is less than that of a rich person, his gambling losses are proportionally higher.
Unless the person is rich and doesn't think about how much money they use to gamble, they will probably get their winnings after gambling for a while. But we know that playing gambling for a long time can trigger a person to lose a lot of money because he can also lose control of himself so he might increase the amount of his bet. He will think that by increasing the amount of his bet and he can win, his winnings can cover the amount of his losses. But he didn't think about the defeat that could come anytime and would take more of his money. Regarding who will experience more losses between rich, middle, and poor people, it depends on how much money they use, how long they spend, and how they gamble, meaning whether they increase their bets or remain with the same amount. It's the same bet as before. And many other things need to be known to determine who will experience more defeats among the three types of people.