Not necessarily, because sometimes luck may strike in and you might win something you would have never expected...
But there arises the question of greed and control, whether you choose greed and go ahead and try to make even more with it, or just get out with what you have made putting control over yourself...
Exactly that is key of gambling and basic thing what we have to learn before playing on any gambling site. We lost with gambling being greedy and want to get more and more. That is very wrong thinking which ruin our life so quickly. Because this decision is really hard to get stop after getting something.
Being greedy on gambling wont give you anything good into you but more trouble in the future because you would definitely lose money because you are chasing for profits. I agree with you its really hard to stop if you already get something. Greediness would really wreck up your life.