The people who have lot of money can be a good gambler because they won't get much life problem even if they lose money in gambling so when you want to gamble make yourself rich.
Having a lot of money does not guarantee that it wont affect their life, once a rich people get addicted to gambling and get very bad luck continuously then it will affect their life obviously. Good gamblers are depending on how much money they have, it is more about how they can manage their money while gambling. Rich but unable to have good money management in gambling = bad gamblers.
When I have a lot of money, I don't want to play gambling, and perhaps I will avoid the games because I know that it can take me to deeper inside the games and I know that I will lose my money. And if somehow, I decided to play gambling, I will strictly make limitations in the games, so I can leave the game before my money is run out. It is sad to see losing the money in gambling games especially if we use too big money.