dear (______):

Dear Craiglist sellers,

If the car you are selling is so old that it is not even featured in the printed Kelly Blue Book, but not old enough to be a classic, has obvious problems that you enumerate in the listing, and you will not offer pictures of the rust or begin to discuss what it will actually need to pass inspection, do not expect me to pay your "firm" price when it is 600 dollars higher than the same make and model that is five years younger.

Sincerely,

a guy who may be mentally challenged at times, but a guy who is also fairly literate and didn't flunk math until he went to Carnegie Mellon (a story for another time).