Ouch! Makes that one I listed on here last year a screaming deal at $9,000. At least that one ran and had lots of mechanicals done and was complete - and I got no responses to my listing and now they are going for $23,000+?. Now was it a real sale or a bait and switch.
When I was researching the values of a 190sl that I was helping to sell, I found several ads that showed as sold but would show up again somewhere else as for sale or sold by a different company. I then talked to a couple guys in the know and they suggested that a good percentage of sales on the net that look like they are too good to be true (either too high or too low) are not valid sales. Many are just marketing schemes for a company or service.