Walking away from the casino after a win is very Important but sadly some persons do not really get it that way, they all their emotions trick them into thinking that they can be able to still make some more money if only they are able to stay any further to try again and some ends up loosing it all, so I agree that until you leave the casino and start putting such funds into use, you actually don't get to really say that you have actually gotten the money, it's your completely after you have started spending it.
Gambling is tricky; it's as if it plays with our brains, which is what most people believe, on which they always link it to the reason why some gamblers react the way they do on several occasions.
If the gambler wins a big amount of money, if he's not the type that controls himself, his chance of losing all that money is very high, as the joy that comes with that winning could lead to an increase in his greed level and his confidence that he's on the lucky side will increase, which can only result in him continuing to try out his luck until there is nothing left to try luck with again.
Sometimes when I see newbies saying that they are making consistent profits from gambling, I just laugh because I know that's a trap.
You can start your gambling career with consistency in profitability but after awhile, all that you have made will be taken away from you.
When you make profits in betting, you will have that mentality that if you gamble with more funds, you will end up in a bigger wins but the reality is the opposite. Gambling is not available for those that want to take money from casinos but for those that are ready to take risk because this is where casinos make their money.