Rdr: You've certainly raised an issue here that deserves airing. Transaction feedback can come back to haunt you if you've been unfortunate enough to have a bad experience, & then try to warn others about it by legitimately posting an objective comment. The offender many times will retaliate and then you end up looking bad for having dealt with them through no fault of your own.
On some sites you can then post an attachment "followup explanatory comment" to the neg. feedback, but not here. If you're lucky enough, then you can get the site operator to edit off the bad post from your reputataion, but I've found this to be hit or miss regarding whether Audiogon staff will help you or not. It's a bad situation because some buyers will automatically not deal with any seller showing neg. feedback (and regardless of the circumstances) which is not right, but that's their choice and it hurts both the legitimate seller & the otherwise prospective buyer.
Now if Audiogon wanted to address a legitimate issue HERE'S one that sure needs looking into, but no they're more worried about this siiiiiilly forum voting, which serves no one and absolutely aggravates many indeed.