The main problem of gambler is greed, greed is not just the problem of gamblers but, I'm every sector, even in your personal life. When ever greed plays out in any place there is bound to be problem.
Gambling is supposed to be done with your spare money and for the fun of it, but most times people because of greed will want to use $20 to get $900000 like how? How on earth do you think that will work out. Greed is a major concern for gamblers and if it is tackled I think more gamblers will be profitable.