I don't know what the rules are today, but when I was in, gambling was a no-no. I remember an incident when my JW sister lived with my wife and I briefly. I went to a nickel, dime, quarter poker game and came home with my pockets bulging with coins. My sister was horrified and told me that gambling was a form of extortion and greed. I tryed to explain to her that it was simply an night of fun among friends. She didn't get it.
I don't play poker any more, because most people play strange off-shoots of the basic game and I don't know what's going on and feel handicaped. I don't play the lottery because of the poor odds.
I play black at a casino about twice a year, and over the years, I break even. I know basic strategy well enough to play a decent game. My son can keep track of the 10's versus the other cards and consistently wins. He plays about once a month. I believe that he is good enough at it, that we could make a living at the game. However, we have both concluded that it would be very boring to play day after day.
I have my own addictions, but gambling isn't one of them. By the way, do the JWs still consider the buying of stocks to be a form of gambling? They did when I was in.