Going...Going...almost gone

From what you say, I'm guessing you don't need the money.
All thing considered, keep the car.
Number one: Obviously, if you have had the car for sale for some time and no one is willing to give your asking price.......... (and the economy is going where?)
Number two: You must like the car a lot. I assume you built it to your specs.
So keep it and drive it.
(And you already have the Challenger comming? Let the kids have it.
Who needs a new car, anyway.)