I like the idea myself but like Clark said, a bad sale could leave a lot of egos bruised. And in this litigious day could be bad news for ETS as well. I would like to think everyone on the forum now would have enough common sense and politeness to make something like that work. If I sold something to someone and they didn’t like it, full refund (less shipping probably), no questions asked. No harm, no foul. Unfortunately, word of a website where people can sell stuff, maybe at a rate less than the fees on evil-bay, would get around and before you know it the forum would be filled with recent joiners plying their wares. And who knows where the forum would end up after that.

And Clark, if I bought a knife made of crappy carbon steel, I believe I would rethink my status as a steel know-it-all.