Keeping most of the money in the wallet by saving it in the form of tokens is indeed very profitable for some people because indirectly it can also be an investment.
But here what I'm wondering is that OP has the nerve to take the risk of keeping such a large amount in the casino's wallet.
This is an inappropriate choice in my opinion because the risk is big and if you have bad luck, it's like the OP where he became a victim of hacking to the point where he lost everything he had in the casino wallet.
I don't know what the OP's goal is by keeping so much money in the casino's wallet, whether to gamble or just save it, but this is a valuable lesson for all of us to be more careful and always consider what to do, especially regarding the money we have.
It's a sign of being a compulsive gambler, you don't make the casino wallet a place to store your funds, two of the unsafe place to store are exchanges and casinos, noncustodial wallets are always the safest.
I'm not comfortable keeping even a small amount on casinos I make sure to deposit what I will use to play and if I won I withdraw it all, I know my limitation and I know how the amount I will fund that I think will satisfy my gambling urge.