Both the rich and the poor give their money to the casino owners because they both gamble. Not only the poor gamble. And yeah, I can agree that wealth is transferred from the money gathered from gamblers to the casino owners but in the case of casino giving wealth to the poor I dont think that happens at all. Money gotten from taxes are not distributed accordingly.
Good point, as it seems that we're talking in this thread as if casino owners were the only rich in the world.
I don't know the real numbers, and my intuition tells me that the long tail of small gamblers adds up to more than what the rich gamble (although I may be wrong), but in any case the rich also gambles and losses a lot of money that is redistributed and should be taken into account in this conversation.