That's right, money can only be considered received at the moment when it is in your wallet. If you won a certain amount but then lost it, then it is obvious that in fact it was not won in the end. All the money on the balance in the casino is play money (one might say virtual) until you withdraw it for yourself. By the way, I use a similar approach for trading in games, sometimes I buy/sell things that cost 100-400 dollars (significant money for me) and so that trading occurs with less emotional stress, I consider these assets/money purely virtual until they ended up in my wallet.
A very factual concept you have put up here, until it's in your wallet for real, you cannot presume the money to be yours totally until you have made it tangible, I me in your wallet or in the form where you can directly spend it for any commodity you are making purchase on at the moment. Most times some gamblers fail to think this way and literally end up loosing all of their funds to the casinos again reason been that they haven't withdrawn the funds back to their wallet so it's still in their gambling wallet making it was for them to just stake in any game but if it were to be in their main wallet the stress of funding would have prevented them from making stakes on certain games.
That's actually the difference, players actually suffer decision problems. They are ideas like, making another deposit that stresses a player not to withdraw his funds. And when it's on the casino balance the player may not purchase other utilities. Some prefer to continue with their already existing money in their wallet to spend on other things.
Then focus on wagering their wins as well. But the idea could cost the player more losses if he's not actively cautious about ways he tends to wager the money. With a well strategized plan a gambler could go through gambling without being in a hurry to withdraw his wins. It shows the player has some control over his actions even when equipped with substantial amount in his bank roll.