TLDR
Don't use the phrase "the rich and the poor" for comparison, as it's easy to conclude that the poor are always wrong. I mean, if you are poor, why would you gamble in the first place? Regardless of the amount, it's still going to hurt you because you are "poor." I think the proper phrase to use is "gamble what we can afford to lose." Regardless of our financial status, as long as we can afford to lose what we are gambling, we should have the same feeling whether we are rich or poor.
You are right, that's just the case if you know you can't bear losing any amount of money you are gambling with then the person is just starting because it is a 50/50 kind of chance in as much as little as the money is, it will definitely matter to the gambler because of one's financial strength; therefore it isn’t a matter of whether one is poor or rich.
When someone is poor and is gambling, This is where you get this set of gamblers that attached this kind of emotions to the money they are betting with, especially when you don't have any source of income and you are risking the little one you have, it would be like they've lost millions when one lost any amount of money on the process.
Regardless or your status, poor or rich, one should always risk according to their financial strength.
I can attest to the feeling because I have been poor and experienced gambling, and it's not fun. When you are poor and gambling, you know that the money you risk is very important, so you'll be emotionally invested in it. When you lose, you think about recovering it because you can't afford the loss. In short, when gambling is supposed to be fun, it doesn't provide a fun experience when you are gambling money you can't afford to lose.
Therefore, poor people have no right to gamble because what they are doing is just destroying their lives. If they do that, people will think gambling destroys lives, when in fact it is the poor people who aren't responsible and blame their actions on gambling, which is unfair.