I guess all rich people keep gambling for some personal purposes, I guess its their past time or a hobby also. They always play in casino but not always I guess
Those rich person can really afford to make gambling as a hobby because of they wealth they have and dont think about money and just gamble for fun.
Whether rich or poor if people can't control them self then it is better to avoid gambling otherwise easily people can lose all their money in these gambling habits. So I thing, it is better to find some other things for fun and entertainments. Some people know when to come out of these gambling habits then then can gamble for fun some times.