Actually gambling is for fun. In gambling you either win or lose, so don't risk gambling. Now if a poor man bets excessively on gambling, he may be left destitute if he loses.
We hear and tell that a lot, that gambling should be done only for fun so that there won't be heart feelings on it whenever you are losing. But whenever you're winning, that's when you are gonna be proud of yourself because the emotion is high when that happens.
On the other hand, if a rich person bets on gambling, he may lose the bet and become poor. However, if you are lucky and win a lot of money in gambling, now greed will work in you, you will want to gamble again and you may become addicted to gambling. Now if you have enough income then you gamble for fun but don't take excessive risk in gambling.
Not that a rich person will become poor quickly. Although for some instances, there are real life scenarios that happens like that and we don't know how to describe that rich gambler that have turned into a poor gambler quickly. They have got all the money in life but they have spent it all in bets that have changed their lives forever. No matter how poor or rich you are, always live within your means and the same goes with your bets. You don't go and be all out with your bets if that's going to make you regret forever.