Gamblers won't steal from you to gamble; unlike a drug addict who will steal and lie to get their next fix.
Gamblers, on the other hand, no matter how rich they are, they can never afford gambling. Some would think that a rich person can gamble and lose money but not worry about it because he's rich, but what happens when he starts betting higher? The higher the bets, the more thrilling it is to gamble. What happens when the person starts going all in, starts gambling with the things he owns (properties, cars, etc)?
Honestly, I would be able to stay under the same roof with people that are addicted to substance. They are just people like you. The only difference is that they are using gambling, drugs, and alcohol to escape reality. If you don't do that, then I'm proud of you. I'm proud that you don't have to resort to doing those things. But you have to understand that this people are just trying to carry on with their lives without destroying anything but themselves. They are not to be disgusted of.