> you have to be pretty lucky if driving a 20+ year old car is a net gain.
I can't imagine a 20+yr old car which is a gain, and I'm a fan of classics and owner of an '84 BMW. In terms of money eating vintage cars are worse than gold-diggers unless you let them rot. One must be overentusiastic by their hobby not to see that's a sinkhole, been there done that ;)