For the rich and wealthy, gambling could easily be something done out of fun or leisure but, when it comes to people who see it for a means of earning there daily bread, it easily feels like an only chance or means to a survival.
Sorry if I didn't get this right, but are you suggesting that reach people are more immune for addiction? If my interpretation is right then I have to disagree with what you said. I don't have exact numbers but I believe it's actually the opposite which is right. Wealthy people are more prone to all kinds of addiction not only gambling addiction. They spend more time playing because they can afford to do so which makes them subject to addiction and they won't realize it till they start running out of money.
Rich people mostly get into addiction as a result of experimenting each and everything available for enjoyment. They never think about money and that's the reason for their addiction. Rich people have a winning mindset which is also a reason why rich people get addicted easily. The good money they hold doesn't let their life get hurt, but with the common man it is something hard as he doesn't have much to spend.
I will not be so much pained or concerned if a rich man is addicted to either gambling, drugs or any other thing. A rich can afford to be addicted, it will take very long before their addiction will affect their wealth if actually it will affect.
What I hate to see is a poor man being addiction. The consequence is simple, it's either he will become a criminal to survive or he will starve to death.
But in all, rich men are prone to addiction more than poor men.