I know that as gamblers, everyone can relate to this question, as we have surely experienced it in real situations.
Suppose our bankroll is $100 and it has already grown to $500, would you quit or continue?
It depends on individual differences, if the person is not so muchly addicted, he will decide to call it a quit. But if it's a gambling addict he will continue playing till he lost it all. For me I will quit.
Conversely, if with our bankroll, we are down to $10, would you still continue or save the remaining $10? I used specific amounts to make it easier to discuss this situation.
Lolz.. what is the exccence of keeping or holding onto $10 again after losing $490? Its better I use it to gamble. Afterall that amount can't do a reasonable thing again. Who knows if toyling around with $10 can boost your bankroll in dieing minute.