Suppose, as title says — you had infinite amount of money, would you still gamble?
Do you know that for some people, gambling is just like means of relaxation and fun. Some people have designed their weekend to be period for hanging out with friends of like mind that they gamble with. So it may not be just for the money multiplication but the fun coming from the relaxation through that gambling.
Therefore, if someone is gambling for fun whether infinite money or not they would still engage in that their gambling hobby.
Drake is a good example, he gambles and doesn't really care about what is at stake.
But what do you say about Infinite money? Elon musk has no infinite money. He is still looking to be the first trillionaire (in dollar) with $251 billion.