The casino pays out of a pool of money that has already been lost. The program is designed to always maintain a positive balance. I'm sure you can make sense of it from there.
Are you openly admitting that your games are fixed so that the house never loses more than a certain amount?
Three Four questions come to mind:
1) How can you possibly think that's a fair way to operate? When you claim to be offering a game called "blackjack" that means something. It means things about chances of winning, house edge, etc. It doesn't mean "you've got a chance of winning unless we're short of coins in which case we'll cheat to make sure you lose".
2) Given that you're decided to cheat players, why admit it?
3) Given that you've admitted it, do you expect people to play your games now?
Edit: 4) Can I get 100 free chips please? Account name "dooglus". Thanks.