I'm happy to drive them around in it (which I state), and to be fair driving the car yourself shows you nothing beyond being driven in it with respect to a used car.
Hahaha are you joking? Driving it yourself shows you nothing? Get a grip and stop being so precious, you are selling an old banger not an R34 Nissan Skyline. No test drive no sale its really that simple. There are many, many things you can hide on a test drive if the seller is the only one who drives!
Anyone who'd buy a car without test driving it is a fool.