If I had infinite money, I also would not gamble; I would only enjoy my money and look for other games that I don't need to spend money on. Gambling is a game of loss and win; I wouldn't want to lose money in gambling when I already have so much. Indeed, gambling is a business. People are more interested in it because of the money, but they always pretend as if the fun in gambling is the most interesting thing about it.
It's very interesting what you say, in some cases they pretend it's fun, but there are cases where they do like to have fun that way, those who are only looking for money from the casinos just leave, because they know that earning money to support themselves or to try to get rich isn't going to work for them, that's something that's already clear, but most like to feel the adrenaline, feel that emotion, win or lose it gives them joy.