When you reach your goal, that's the time when you should alert yourself to stop because greed rings up your mind and you should know how to cut the call, else you might gamble again and lose what you already had.
even if you have set a limit , there is a time for you to lost control ,
and as for the result you crossed the limit and never know when have to stop ,
the sure thing that can make everyone stop gambling are when they lost everything ,
this is the most case happened.