Let's first talk about how the poor gives the money to the wealthy.... They allocate a huge part of their money (which isn't a lot in the first place) to gambling thinking that this would be the quick fix to their problems. This is how they give the money to the wealthy in this case the casino owners.
Money moves from the poor people to the wealthy in everything and not only gambling. The rich understands risks management and they have better understanding that the money they're staking is as good as gone hence they don't put their mind on the money but for the poor people, they can't get their mind off the money they're using to gamble. The poor gives more reactions when they're losing but the wealthy mightn't bother because they have more of the money and not putting all their hopes on the profits they were supposed to get from the capital they have already invested into the casino.