Well as long as Audiogon allows this and more members dont complain then there isnt much that can be done.
Please dont frame this as you helping other audiophiles. The true goal is to increase your readership or base as much as possible. Audiogon is allowing you to use their site to do precisely this when they will not allow dealers to promote the products they represent.
From my perspective it reflects poorly on you, Stereo Times and Audiogon. But I dont read reviews so you havent lost a follower.

