We seem to be getting closer on our ideas. I wonder why you think that I don't trust buyers/sellers with substantial feedback. If I read correctly, that's Bishopwill and others. I personally have 270+ positives with no negatives between here and Ebay while doing deals for well into 6 figures. Me?
I trust anyone with virtually all positives, who sounds and acts solid. Act flaky and scare the hell out of me. I don't need to buy or sell so, make me nervous and we've got no deal to do. Easy. Your personal choice to look only at recent feedback doesn't work for me. I care about character and history and subtance. I buy substantial items regularly and work to be cost effective but not be scammed.
I'm certain that Audiogon could expand the verification system and combined with verification and documentation enter into an insurance arrangement with a 3rd party provider to insure transactions.
BUT and I really mean BUT, if a thief wants to steal, it's going to happen. Maybe to me, maybe not, but certainly he'll find willing participants.
I'd really like to see the feedback include the amount of the sale, if buyer or seller and type of payment. It makes evaluating the prior transactions more effective.