I tend to keep my cars. Once I've decided that i'm keeping it, then thats pretty much it. I've been driving for over a decade now, and of all the cars ive had i have only sold 2.
My Legacy is a good example, its not worth a lot, but I bought it on a whim off trademe, and It suits me quite well. It was pretty crappy looking when I got it, and I've spent a fair amount on replacing parts which I know I'd never really get back if I sold it. Given the time and effort i've put towards it, I'd hate to come across it ruined a year later, knowing that all hard work and effort was wasted.
Part of the Riflemans Creed from the movie Full Metal Jacket springs to mind "There are many like it, but this one is mine"