I think there are two kinds of gamblers. 
Gamblers that LOVE the Action.  These are usually loud and energetic people that are very sociable.  They like the thrill of winning and usually play skilled based gambling games like poker or sports betting....maybe blackjack. 

Then there are gamblers that gamble to escape their problems.  This could cause a lot of problems.  They are coping with their pain through gambling.  They usually play luck based games like slots.  These are usually quiet and normal people.  These gamblers however I feel can be turned around.  However an Action gambler will always be an action gambler.