Although poors and riches play in different ways, it doesn't give any advantages to the riches on long run. It's like saying someone who place huge bets with 1.01x multiplier on win and 94% winning chance is in a better position than people betting with a low bankroll, 2x multiplier and 48%-49% winning chance. One huge bet lost by the rich gambler already put him in a much worse situation than the poor gambler who is gambling with pennies. Riches lose much more money than poor gamblers, because they have more money to afford to lose on long run.
I think what we can say is that money lost by poor gamblers will be missed later for basic needs, while for rich gamblers it won't make any considerable difference at all. It's probably just change money...
At the end of the day the odds are usually the same, independent of how much you gamble.
And I think most rich people are not that interested in gambling anyway, because they are rich already.
That's one of the biggest things in gambling, the selling of the idea of becoming rich.