But when a gambler has what we call limits management, they tend to be able to pull out when they hit their desired jackpot just like in this case.
Someone who gambles with responsibility always take rest and try their luck after taking that proper rest and such type of gamers also withdraw their winning and sometimes take long breaks to enjoy the won amount or invest that amount into something useful.
I have a friend who hardly withdraws his winnings. He leaves it in the casino and tends to continue gambling with it. I always tell him that, if he doesn't withdraw his winnings, he hasn't won yet. A responsible gambler should know when to take a break and when to continue gambling.
Well, first find out what his plan and target is before you judge him, it's very possible he has a plan and a target of what amount of money he needed to win or have on what account before he makes a withdrawal, and if the amount of money he won isnt up to that amount of money he has in mind, then it's simply means that he hasn't meet his target yet and there is no need for him to withdraw money he still will end up depositing back to the casino.
This is another angle to see this from and I think it is sensible, like I won $20 when my target is $1000, I withdraw the $20 and even spend part of it on withdrawal fee, and by the next day, I deposit the $20 or $30 back to the casino to continue playing, the withdrawal fee I initially paid for that withdrawal is a loss, makes no sense.