Haven't meet one, but i have lot of friends who loves to gamble but turned out to have a miserable life in the end. What my perspective if you're living through gambling, i think everyday is living at the edge for you. That path maybe full of hardships and loss, i can't imagine how one can feed their family through that lifestyle.
I'm of the same mind as you. As long as it's gambling as a hobby, fine. If you can give yourself a cap to gamble, but in the meantime you've already stabilized your life through another business, then it's more than doable. But if it's just supporting yourself on that alone, like you said, I have a hard time seeing a family there.
If you treat gambling as a hobby, sooner or later, you can become addicted to gambling because we know if someone has a hobby, he will prioritize his hobby as the primary thing. He will not think about the other thing. But if you can use gambling as something to enjoy your free time, and you always control yourself, you don't have to worry become addicted to gambling. It is better to use another business to make money, especially if the money is for your family. But the best thing is you need to stay away from gambling for a while.