future value of classic performance cars,when to bail out, before the crash?

If you have driver quality muscle car you drive a fair amount and enjoy, my guess is you can drive it for 5-10 years and probably get your money back or more. Try that with any new car. Most new cars sell for $20-50k, not that much different than a decent muscle car. Maybe our cars are not the best long term investment, but I doubt that they are big long term losses, unless you are way at the top of the market.

The above assumes, of course that your labor is a hobby and done for the love of the sport, or just plain old obsessive compulsive, or in some cases a cover for beer drinking.....