To be fair, rich people are just throwing money to a thing that's only entertainment to them and it doesn't interest them to spend a lot of hours in a casino. Their priority is their real game, the way of making more money than spending time on a gambling that doesn't really assure a huge profit. Rich people already have a game that gives risk but also assure a good money, so this gambling thing isn't a way for them to find money. Most of the time, they gamble just for the thrill or to socialize, not out of financial need. When they lose, it’s just part of their entertainment allocation, they're not affected to it.
You are very correct. The difference is that wealthy people don't gamble for financial needs, while the poor gamble with high expectations of making a profit. Looking at gambling, the psychological aspect of it is what leads gamblers to become addicted. It is very hard for those who gamble for entertainment to become addicted to gambling; that is why the rich don't easily get addicted. The reason why people often face challenges in gambling is that they are very desperate to gamble at all costs.