I have to disagree with you guys on Rich people getting addicted. Those who are rich don't have the time to get addicted in any other thing than money. They spend literally several hours only to mint money and buy lesiure with that money. They won't spend their time & money in gambling. Only people like us spend money on gambling, we start with the believe that we will double our money and what happens next is known by everyone.
I think both rich, poor, and normal-status people are prone to addiction. There had been cases and even an article stating rich people are addicted to gambling. This only means that gambling addiction can affect and infect all walks of life except those who are not gambling of course.
People who are very busy with their work and have little to no time to gamble is surely safe from being a gambling addict but rich people who have plenty of time and find gambling as a way of entertainment may develop gambling addiction if they failed to moderate their gambling activity.