It's quite a common scam unfortunately - I have CCTV set up, only allow 2 people to view a car and have a couple of friends supervising to avoid this kind of thing.
Another reason I absolutely hate selling cars - I even got grief from one forum member after he travelled 100 miles to view my 75 (described as a workhorse with some cosmetic defects) and found it wasn't absolutely mint (for £500!)
The mind boggles...
