If I was rich I would gamble for sure, you can make a lot more money if you already rich with gambling.
If I am rich, I will gamble but my focus is different, I will gamble not to make money, instead I would gamble for pure entertainment that I cannot experience right now while I am not yet rich.
The question is 'what if' though so it's only okay to assume.
If I were rich, gambling would be a 'just for fun' activity. I mean, I'll consider it as a game. With that set in mind, I wouldn't care much for the little amounts that I'll be losing because I had fun. It's a bonus that I'll win because I had fun, plus I won something.