We need to be practical as what you mentioned, you need to be positive but also we need to make sure that we are careful in terms of our finances, being rich or poor in terms of gambling needs good self control to avoid making big mistakes and lose all your money from your savings, but as long as you have that good control whatever your position in life there's a big chance that you'll be able to avoid losing more than what you can afford to lose.
Though in most cases, rich people is the one who can control as they know how to value their money and they are keen in keeping their setup in terms of controlling their finances and avoid overspending of their balance.
But you have also definitely come across rich people who ended up losing their wealth because of gambling. rich or poor all depends on the gambler's ability to control their finances. at least gamblers should know how much they can bet and which money they should not touch at all.
In gambling the risks remain the same. because the limits of a gambler's ability are certainly different, whether it is a rich gambler who is ready to lose more money or a poor gambler who is ready to lose money within his ability. The most important thing is not to force your desire to bet more and exceed the limits.
You are correct, there are rich people who also suffer the same fate losing everything due to his addiction and I also agree that it depends from how the person treats his gambling activities, though my point is for those rich gamblers who knows how to manage their finances, since they've got a good source of money they can balance the entertainment and the luxury of involving themselves into gambling and not to fall that hard to lose more than they can afford to let go.
Though again, a case to case situation and there's different opinions and perspectives in terms of gambling participations.