I gamble to make money but it also has to be somewhat fun because if it was not fun I would not be doing it.
Having fun while gambling is important because if not you are just going to be mad.
That should be the behavior but unfortunately most of them go to a point where they are desperate to recover what they lost or if they are winning getting unsatisfied for what profit they get.
that behavious only stems from the greed that every people have and it is actually a lot bigger in gamblers who are trying to win more money so when they lose this gree of theirs becomes more thus leading to losing more.