Everything turned out fine. I just politely explained to the buyer that they were an unknown quantity, while I have a track record here and on eBay, and that if he was not comfortable letting me have my funds guaranteed before I sent the item out, then no deal.
I was just curious if this was commonplace, since the few times I've done sales with EMTs, I've always received the payment first, and likewise while buying, I always make sure the seller gets their funds before they ship. In theory, EMT could work as an escrow, but the fact the sender can revoke it at any time doesn't make it so.