This theory breaks quickly when seller or buyer needs to do transaction urgently for many possible reasons.

There was a guy (in a city I used to live) who drove by a Porsche he likes and asked how much? Lady asked him if he wants to see other cars. It happened that her husband just died and she wanted to get rid of his estate worth of luxury cars that she hated. The guy borrowed money from his relatives and ended up with about dozen of rare/luxury/sports cars for pennies at a dollar.