i think rich people can handle the losses better since it won't affect their basic needs. but poor people might lose their family stability, mental health, ... after a loss! in general, gambling can be addictive regardless of someone's financial status and should be viewed as a form of fun.
Both rich and poor people suffer almost the same thing when it comes to gambling, losing, and the amount they place on a bet. One thing you need to understand is that if I'm rich, the amount I will be willing to risk will be based on the wealth I have, which is also the same thing that the poor person will do; they will gamble based on what they have and what they can afford to lose.
Irrespective of whether the person is rich or poor, if they don't control their gambling, they can still lose it all, losing money without getting it back, and if you, as a gambler, don't draw a line to stop it, it will only lead the person to a day when they will have nothing to place a bet on.