Wow. NONE of this has ever happened to me. I use lengthy comprehensove descriptions with four or five large, focused hosted pictures. I request a cell or text in reponse, and of course, once you have a text you have a phone number. I always start the conversation by giving my name and asking theirs.
I always show the bike during business hours in the parking lot of a nearby shopping center that has a bike store, so if they need something bike-ish (helmet, pedals, gloves) the store is right there. The store guys love it (adds traffic) and my customers (vintage restored bike, downtube shifters) are not going to buy a bike from them, so I'm not the competition. Actually, the deal is, every time I finish a bike I'm supposed to bring it by the store so they can ogle it.
I do about 15 bikes a year, and every one through all these years- with only one exception- has sold to the first person who saw the bike. Cash. No pricing haggle. Never been stood up.
Am I doing something wrong?
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Hard at work in the Secret Underground Laboratory...