I don't necessarily agree that a good gambler is a good tournament player. They are two different types of mental games. I good gambler must have the heart to stay in it for hours on end, a tournament player must have the ability to play his best game every time he is at the table. I notice, when gambling, sometimes losing at first is not always a bad thing, as it might take a set or so to get in stroke. However, a tournament player doesn't have the benefit of coming and getting him back next set.
As far as gambling helping your game, I don't know if I totally agree with that. Some people do need to gamble in order to create that pressure situation. I am still young, and I am still increasing my salary. I started playing in pool halls when I first turned 18. At that time, playing for two dollars a game made me a little nervous, now losing a couple hundred in a night doesn't seem as hard to do. Sometimes I wonder if gambling is really what creates that pressure, or is it the fear of losing your money. As I get older and make more money, it takes more money per set or game for it to really matter whether I win or lose. When I play in a tournament, I try to bring my best game possible. Sometimes it was hard for me to play well. So lately, I have found that if I mentally take myself to an important match, or pretend that I am in that tournament situation where I always have to bring my A game, I have become a much stronger player. If you can force yourself to create that pressure without any reason to, I feel that it will help you more than playing for money. Trying this was a tip from Nick Varner. I had an extensive conversation about 8 months ago. Another thing he told me, "it doesn't matter why you are shooting a shot, whether it is practice, or in a match, make sure that you are confident that what you are trying to do is in deed going to happen. If you are trying make the ball, if you don't feel 100% confident that you are going to make it, stand up do something until you are very confident that you know what is going to happen after you hit the CB."