US Audio Mart allows contact with buyers and Agon does not unless you pay the fees upfront. I list in both places and stuff sells on Audio Mart most of the time as folks can have open and honest conversations. Agon needs to change their policy.
Why would I pay Audiogon upfront for something that may not even sell on their site? I seem to sell things much quicker on US Audio Mart when I post the same gear on both sites.