You expect the person using the escrow to check whether the escrow and the seller is not the same person? 
LOL! so you blindly trust that the escrow isn't doing that? Don't do that, you'll be sure to get scammed. Absolutely you need to be checking that the escrow isnt trying to scam you. The whole way we use escrows here is FAR from perfect and there are many ways to get scammed including this way.
QS should be glad this is an anonymous forum. Else he would probably have been sued a few thousand times now.
Lol. It is not an anonymous forum nor has it ever been described as one by any of its operators. The forum collects the same amount of user information as every other forum running SMF does and Theymos provides this information to law enforcement whenever he is served with a subpoena. Additionally he claims he will provide said information without a subpoena when contacted by a law enforcement official regarding a user that is strongly suspected to be scamming and there is strong evidence to suggest that, something most other websites would never do, most websites would refuse to provide any help to the government unless they are compelled by a court to.