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.
When someone who already has a lot of money gambles of course they don't think about the money they can win from the bets they play, because they already have a lot of money to be able to meet their needs and I agree with you they won't spend a lot of money gambling so They will very rarely experience addiction because they only use their free time to gamble and they will spend more time with their work.
That's right, indeed some gamblers who have a little money will of course hope to win from the gambling they play so they will continue to bet and quite a few of them experience addiction from the gambling they play, but if they can manage the gambling they play, of course they will not spend much of their money on gambling.