I'm not sure there is any way to prevent people from leaving the escrow system. It would be nice and much better that way, obviously, but no matter how the system functions, people will always find a way around it. The saddest part to me is that people are FE'ing for these scams simply to get "free shipping" on an order which will never arrive. Finalizing early just to save a few bucks on shipping is such a bad decision.