I don't think having enough money from gambling should make one to quite playing gambling in my opinion. Making good money from playing will rather make me to play more gambling and not the other way around. For now the only thing that make me quite gambling is when my capital in the gambling exchange is finished.
Some gamblers that want to secure profit will not allow those profits to be recovered by the house. So the tendency, they stop and spending the profit for something better and keeping the capital that they've used.
But there's also the spirit of being confident that you either continue to win more which makes every gambler to have that intense feeling. And it results to gamble more and it's a 50/50 on our ends and it will definitely make you stop only if you have nothing anymore.