It is very clear and it is usually an entertainment for the rich people. They show their entourage or their business partners to show how much money they got when they bet on a game like poker. But for poor people, gambling was never an entertainment because the rush to win is already right from the start because they hunger for a lot of money.
You are right. Wealthy people don't care about money too much thus they can focus on the entertaining part of game. Just as poor people can't be happy enough at any activity due to lacking enough money for life.
For poor people, actually play gambling to get instant money is something wrong to do. Because it is better for them to do more important thing else than do gambling because it's risk is high and can take all their money.