It's more recouping losses, as we've already lost a significant amount
You're a casino, you're in the business of taking people's life savings. Playing the victim card doesn't seem right.
There's always 2 sides to every story and then there's the truth. without knowing exactly how much money they "lost" we can't really know anything. The OP hasn't explained how much money he popped them for either. Maybe he should do that. obviously he must know.