Experience could be helpful in making us give value to the little profit we might have gotten from the little win. But for those gamblers so greedy for huge wins they find it very difficult to give value to those small wins they get and that makes them to throw in back the little profit they could have walked away with to later come back another day to try again. When I see gamblers do this, I just conclude that they are not appreciative of their luck in the little size it comes except it has to come huge. Whereas, there are those that are just praying to earn same little luck for such small profits but they just not earning it still. 
It is very true, for that reason luck should not be thrown away just like that, we should value our luck at all times, it also makes me sad to see that people sometimes risk so much to lose it at the end, at least that has happened to me and it has given me a pain that I learned, every time I have a profit what I do is withdraw.