It's impossible to stop gambling especially if you've won so much Bitcoin. On the other hand, most people only stop when they have got nothing left.
You are right, I don't think that people they didn't have any greed about money, even too bit greed. So even a gambler win a huge amount that he can live with it in the whole life, they want more.
Yeah, it is impossible that people stop or quit gambling if they already achieve their desire from it. Even i think gamblers play gambling more becasue they have earned from it and in gambling usually gamblers have no limitation to quit gambling in the winning stage. The reason Gamblers have no least stage of greediness.