I don't think he even believes that OgNasty is attempting to pull an exit scam. He was trying to solicit someone to wire $20,000+ to a car dealership and claiming that only after receiving a car from said dealership would he send bitcoin to
anyone. He was claiming that the paper trail left by the DMV/car dealership would be a "stronger" escrow then any forum based escrow, even though the DMV is not in the business of forcing people to send funds to any third party.
He has a
history of refusing to deal with escrow, even when the amount in question is very small ($50).
Someone had suggested several escrow services, and a few people said that any of the recommendations should be trusted with $20,000 worth of escrow, however I would say that most of the people that were recommended probably should not be trusted with that large of an amount, but OgNasty is someone I would personally trust with that much money if that was something I needed to do to get a deal done. Although I cannot guarantee this, nor say with 100% certainty, however I believe that the chances of OgNasty pulling off an exit scam are fairly small.
Also:
Regarding escrow, if you are serious about getting this done, then I would suggest OgNasty. He is currently holding over
$240,000 worth of bitcoin. He also recently
released 130
BTC in an escrowed deal for a bunch of miners which is almost triple the amount of your proposed deal. I would personally call it ridiculous to think that you wouldn't be able to trust him with $20,000.
Bottom line is that a paper trail of a transaction is not going to protect anyone against you scamming them, the same way that the trail that the blockchain leaves is not going to protect you from a scammer.