I think gambling has little to do with wealth, I mean, both poor and rich people gamble, win, loose.
The difference is that rich people don't care about loosing as much as poor people do.
If you are rich you just don't know what to do with all that money, so you play; I think I would do the same.
There's a difference because rich people have so much to lose if they are not careful in gambling, they know that because in gambling there's no limit or winning and losing but the big problem is there's only small success rate in gambling.
I don't think that some rich people is always lose? I think some of them is still getting rich? we cannot say that but just like you said be careful if you have playing gambling because gambling can take your all money in a short time, but in gambling also you can make profit in a short time.