
Sometimes they photo a strangers car , you only get exterior pics then they scam buyers asking for a small deposit to secure the car .(£200-300)The normal reason given is that so nobody can identify the exact location of the car to stop any potential theft
The cynical reason is to avoid the taxman or any "comeback issues" for traders who pretend not to be traders

I wouldn’t use a supermarket carparkAll,
Why do people who are selling their cars take pics at suprmarket carparks?
So, if they take a pic outside Harrods while their car is stuck in traffic, they will get an instant sale?Depends which supermarket it is. If it's Waitrose they may be in with a chance.
So, if they take a pic outside Harrods while their car is stuck in traffic, they will get an instant sale?

I would assume they are proud of their cars and want to show them off? I tend to take photos of my car or bike to show I was there,
not a picture post card but one showing I was there without showing myself in photo.