What other factors do you know contribute to form addictive gambling?
The first time I read the whole post of OP, I laughed a bit just because on how he brings up that "free alcoholic drink" as the reason why he lost too much money. At first place, he can just ignore or not to get those free drinks if he really doesn't want to, right? If he didn't try those alcoholic drinks, will he lose his money? I don't think so unless that man is really addicted to the point that it doesn't need alcoholic drinks just to empty his wallet.
Overall, self-control really is a very important trait especially when you are gambling. Knowing when to continue and when to stop is a big thing. Not having a self-control and discipline will lead to these kinds of things. Wallet getting empty, savings being gone because of gambling etc.
Now with regards to other factors that can contribute to addictive gambling, I believe peer pressure is one.