There's certainly the loss of people who have already withdrawn.
This is true. Those accounts will have a negative balance. If the missing coins are never repaid, I will cover that loss with my own coins.
I just looked into this. 12 accounts have negative balances, indicating that they withdrew their profits from the fake bets. The sum of these 12 account balances is -6.08206405 BTC. The individual balances:
-0.00048667
-0.00672428
-0.01169665
-0.02610149
-0.02801511
-0.05864094
-0.14724078
-0.26096498
-0.52177427
-0.53065989
-0.97780326
-3.51195573
So only one person benefited by more than 1 BTC from this.