If a person has the self discipline in life then everything becomes easy as they can control their emotion and greed. Greed is the biggest factor that drives in gambling and this can actually make you poor if you keep on playing it.
Apparently, greed is too difficult to control, especially when we are at gambling places. With so many people getting bad results because of gambling, it is proof that greed is a frightening specter. Even though someone is able to control himself until now, but it is possible to get out of control at a later time.