So my question is, is the percentage of the rich gambling lower than the middle and lower class?
I may say yes. Reason being that the middle class or the poor sees gambling as a game of fast way of creating wealth, or a way of becoming Wealthy. The middle class always think there is always an opportunity to use gamble to change the entire story of their life by breaking out of poverty. And this singular reason has made many to get addicted and yet nothing to show for. Instead of them to win they keep losing and making the casino site Rich. The rich usually play but not often. The ya their games when they are free or when they want to have fun maybe on their vacation after time off from work they will look for a casino to chill and gamble after which when works resume to go back. That is how the rich plays their games because they already have a steady means of income, not like the poor who depends on it only.
Most rich people are into gambling not mainly to earn money but for other reasons. Hence, they don't have the desire to gamble all the time. They usually select what game or sports they will venture into. In most cases, the sports they are passionate about. But for most gamblers in the middle class or poor, as long as they see good opportunity, they will bet on it.
But for those people who gamble just because they want to earn money, gambling will be detrimental to their small money left.