I haven't sold on audiogon for quite a while, but I've sold about 6 items in the last year with no problem (canuckaudiomart).
I listed my MBL 121 monitors last night and they were literally sold in five minutes. And within a couple hours I had 10 more offers to buy immediately. (But then, I tend to list things for cheaper than they are normally found. I don't mind losing a few hundred bucks or whatever in order to make a fast sale).