Sub 1000 mile cars may be worth a considerable amount of money in 30 years time. An Escort Cosworth with a few hundred miles on it sold for over £110k at auction recently, but to cash in on that, you really have to play the long game. I'm sure if you used the original purchase price as working capital, you could turn it into much more than that in the same amount of time, as well as taking out some pocket money along the way.