Lots of gamblers start by having fun only, and then once they lose, they want to take revenge on their bad luck, by betting again hoping for good luck, this is where the pain begins, since this means you are an addict and will keep on gambling to ridiculous levels. If you are prone to addiction, never gamble.
Those type of gamblers has not discipline in gambling and mostly they lose big in the long run because they will not stop until they go bankrupt. To have fun in gambling we should limit our bets as it is very annoying to say that gambling has wreck our life which was suppose to be fun.