Some people take pride in photographing their motor at the front of the gaff with loads of other shit on show.
I've heard of lads who advertised a car, someone turns up and test drives it, haggles a price and says they will return.
But, they were scoping the joint and do return to break into the gaff, steal the second car or lawnmower which was seen in the shed etc.
Plus you get cranks who genuinely buy the motor and a few weeks later return with a grievance about such & such and expect you to do something for them.
The less these private buyers know the better.