It is an old ploy to have a older car in the showroom to attract customers inside.
Chev and Ford are the ones who do this a lot.
They will take a car in trade on a new one...or buy fom someone needing the money...they just about never pay full top dollars from a private seller.
Had a friend (jim) who owned a parts house/machine shop. He picked up a small T Bucket Ford for a low price because the man needed the money. Jim's wife did some of the invoice work in the office and drove the "T" to work each day. Trippy to say the least.