You should complete a few deals with reputable members and show that you are not just another scammer.
... before you pull your scam.
This sounds like "Scamming 101"...
That *might* warrant a change in rating from negative to neutral. Escrow should still be used when dealing with the OP either way.
edit: regardless, if the OP is who I think he could be, then he will likely not bother with building up trust like that