I am not sure that they are living that large. NG had a copy of the contract with the bond company(one or both), and the Anthony put up a promissory note for the bond money of 50,020. Which means they put up something worth that much, that if they do not pay(which they have not yet) back money plus interest, whatever they put up, will be forfeit to the bond companies. If they had the cash, I am sure they would have put up the cash.
They have to pay this money, no matter what now. It is gone and lost to them. If Casey disappears, and the bond companies cannot find her, then they will be on the hook for the 1/2 million, not the Anthony's. The 50,000 is their fee.
(I am now considering becoming a bail bondsman. They make alot of money.)