Most of this equipment depreciates quite quickly. How much is a used piece of equipment worth? As much as anyone is willing to pay for it. I agree with all comment in this post, good to see that I'm not the only one who has dealt with sellers who exhibit some of those characteristics.
One the "buyer" side, I have had bad experiences with those who want to deal with the negotiation by email or cell phone, bypassing the Audiogon formal "offer" feature. I had one guy call me and after the "dance", seemed to come to agreement on the price. He drove the 90 minutes to get to my house for the pickup, when he arrived said that he thought about the price we agreed on and could only offer me $600 less. Of course, I don't deal with people who do such things, let him know that. He actually asked if he could see the unit.
One the "buyer" side, I have had bad experiences with those who want to deal with the negotiation by email or cell phone, bypassing the Audiogon formal "offer" feature. I had one guy call me and after the "dance", seemed to come to agreement on the price. He drove the 90 minutes to get to my house for the pickup, when he arrived said that he thought about the price we agreed on and could only offer me $600 less. Of course, I don't deal with people who do such things, let him know that. He actually asked if he could see the unit.