I've sold and bought A/V gear at Audiogon for many years now.
Last year i managed to snag a store-demo, almost brand-new Runco Q-750D LED projector for less than 1/3 of msrp (unbeliveable find and buy) followed a couple of months later by an Onkyo Integra DHC 80.2 manufacturer reconditioned and warranteed, for less than 1/2 msrp.
So, yes, Audiogon / Videogon is a very reliable site for selling/buying A/V equipment but when it comes to contacting any living soul at Audiogon either by phone or email, GOOD LUCK to you !
I had some problems last year with the payment for my last purchase as well as the rudeness of the dealer and tried contacting the company several times to no avail, they don't even bother to return emails which is very frustrating considering that sellers have to pay a fee to use the site and it seems to me that the least they could do is to answer questions and concerns from paying members.
I remember specifically one of the most annoying problems i had sending payment to seller : once i clicked on the site's link for "send message" the entire purchase agreement and all pertinent information disappeared completely off the site, and there wasn't anything either the seller or i could do about it, even after 7 days of both of us constantly tring to reach Audiogon; I had to send payment to seller directly through Paypal and bypass Audiogon, a fact i felt rather nervous about even after doing extensive search concerning the seller's reputation, feedback, physical location, PayPal registration, etc.
As for your problem with the site still trying to bill you for a purchase, i would simply ignore it since no one in the company even bothered to return your emails and i imagine that you haven't started any payment process either by credit card or Paypal, in which case you should contact them directly and inform about the purchase cancellation.
As for selling your stuff, go right ahead, place your ad and see if you get any offers that you'd consider and take it from there; Just remember to never click on that damn worthless link i mentioned above.
Good Luck to ya' >>> Marcos
Edited by MCaugusto - 6/8/12 at 4:31pm