I heard these stories of people who totally changed their lives by gambling but I wonder how many keep the money they earned.
I don't believe that gambling can change their life in quotes. Gambling is only to measure luck and to entertain oneself. Sometimes I also feel strange about the stories told by people that gambling can give them something that can change their lives. What is meant by change may not be how much money is earned, but how much money is used up or changes from rich to poor.
In its nature, even if someone gets a big win at gambling to change their life, maybe yes, it can happen, then he stops gambling activities, but I'm pretty sure also that when his money is running out and can't get any more money from business activities or anything after they gamble, he will return to gambling again to seek luck again, and this one-sided view really can be logical. But surely when he gets back into gambling he will use bigger margins than when he had not found his winnings, and surely they will also end up gambling again, to hang his fate.