And a sucker to boot.
I suppose you wouldn't complain if he spent his free time collecting multi-million dollar pieces of artwork or automobiles. Just because people have hobbies different from yourself, doesn't mean that those hobbies are wrong or are "a problem".
You seem to be assuming it is an addiction for him. This article does not indicate that. While it is hard for us to imagine losing millions of dollars over the years to gambling, unless it was a sickness, that has more to do with the fact that we don't HAVE millions of dollars to lose.
According to this article, there is no indication that he ever gambled more than he could afford to lose, and hes family has never been deprived of anything because of this. I personally think it is a waste of money, but it is his money to waste. One of the benefits of the free-enterprise system!