Mitch - in order for them to accept the transaction, they need to fax in a copy of the card (back and forth) or front of card and a piece of ID with their
signature on it:
https://www.escrow.com/support/fax_in_form.asp
They do provide info on what happens if the domain seller doesn't transfer the domain (but not the other way around):
https://www.escrow.com/myescrow/incl...ex2.asp?qid=67
Here's the FAQ for domain name purchases.
https://www.escrow.com/myescrow/incl...dex2.asp?sid=9
All payments are final but they don't elaborate on 'worst case scenarios'
Maybe 'trust' accounts are protected from 'chargebacks'? Also, I'd assume that if it was their error and you've received your funds, that they are responsible for the charge (since they have to do the due diligence).
http://www.escrow.com/resources/EscInstructions.asp (see #14)