IMHO, the problem lies in a mix of all the points brought forward here. Mike's points were right on, in that there's such a plethora of information out there, so the buyer goes through it to make their decision. Buyers have replaced the dealer visit/audition with the internet, as a form of information gathering. That, coupled with aggressive Audiogon pricing (a cycle started by the gear flippers and thoroughly supported by dealers who would feed them gear), has created this market...
I may be old school here, but I much prefer a proper audition instead of internet opinion. And I much prefer to work with people (as Mike said, people buy from people, specially people they actually like!) than some random guy across the planet on Audiogon...
Oh, and Rob, perhaps a dealer could help offload those pieces of gear you don't want anymore, at a decent price, without having to go through the Audiogon circus...
cheers,
alex