~snip~like for example I bet the first day I lost $500, the second day I lost $1000 and the third day I won $1000. despite getting a $1000 win but a $500 loss.
but back to that there are no guarantees because the luck of every gambler is different and all of this depends on a commitment not to be greedy. even though someone is lucky to beat the casino make a lot of money but greedy want to earn more I'm sure he will lose even more soon and fail to beat the casino like the problem of that time a person won over $500k but wanted to win $1m and finally all his big win was gone and failed to beat the casino.
in fact this is also a game on a gambling system, people who at first hope to win will actually make more deposits and after that, they will be given a win which can be said to be not in proportion to the initial capital spent, as you explained. But even though some people experience this, there are also players who at first only deposit a small amount, for example, only $10 and get profits of up to thousands of dollars because they manage to get the Jackpot. this is an inducement for players not to stop making bets so that the bookies will take the win again. this is why it is necessary to control the bet after winning, so that it does not turn into a wasted win.