Solely in my own opinion, I would hazard a guess based on the people that I have worked with in the past. They want a BMW to show how successful they are, but a second hand one is not going to cut the mustard. They will know its an old one, and the other people they work with will know its an old one, so its not much of a status symbol.
Now, as for the people that want to buy a cheaper older one, they probably won't know anything about cars, so they will be buying a car based on image. As they know nothing about cars, they will be getting them serviced at a dealer, which will cost them a bomb. A thousand dollar service for a 100K car is fine, but not for a 9k car.
So, maybe you want to add the words 'not a fairmont' or 'not a statesman' in the ad

You might attract people that can afford it but can service it themselves?