After your car has helped you through so much... you would turn your back on it and sell it.. oh man that's cold lol j/k
I don't know man, if you could find something as comfortable/affordable/fast as yours for a decent amount of money, I don't see why not. But I don't like putting work into something just to sell it. I would keep it until it dies on me.. but that's just me. And if you don't get something as fast as your GP and you get smoked by a GP? Man then you'll really miss it.
I say do NOT sell it. You put work into it not to sell but to enjoy.