I think that's just the nature of dealing with the public. Back in the late 70's when I sold high-end equipment at a brick-and-mortar retail shop, same sort of thing would happen back then.
The worst Audiogon experience of this type was when a guy who lived about an hour's drive from my home said he insisted to pay me cash, we talked and came to an agreement on the price, when he arrived at my home he said he thought about it and changed his "offer" reducing it by $600. My takeaway from that was that he was attempting to circumvent the process of making a formal offer on Audiogon, so there would be no evidence, so when someone uses the Audiogon email system to negotiate the price, I make them make a formal offer. Using that method, I still get the "low ballers", but haven't had a real sale that wouldn't go thru.
The worst Audiogon experience of this type was when a guy who lived about an hour's drive from my home said he insisted to pay me cash, we talked and came to an agreement on the price, when he arrived at my home he said he thought about it and changed his "offer" reducing it by $600. My takeaway from that was that he was attempting to circumvent the process of making a formal offer on Audiogon, so there would be no evidence, so when someone uses the Audiogon email system to negotiate the price, I make them make a formal offer. Using that method, I still get the "low ballers", but haven't had a real sale that wouldn't go thru.