If you are extremely rich and you can just gamble up to your heart's content, does the novelty of winning wear off? Like would you get tired of gambling since there's really not much risks because you can gamble with any amount and still receive little to no consequences?
But regardless of the money, there will always be some refreshing statistics like "highest multiplier", "10 winning bets in a row", etc.
In general, I agree that if there is no financial background to the win, then it means less, but gambling still makes sense. As we know from examples, many gamblers who hit the jackpot continued to play, so it was not about the money. Besides, even if you are extremely rich, you can always make a bet of a size that will be sensitive for you.