Bony, as usual, has a well thought out and accurate answer. Yes, 60's muscle cars have went up alot, but it took 40 years to do it. A shelby only 7 or 8 years ago didn't command nearly the money it does today. Last year I couldn't click (buy it now) on a low milage GT for under 170, let alone 150K. I'm still waiting to buy my GT, probably over the winter, but not as an investment car. Passion for the car is the driving force. I hope after I buy it that it doesn't go goofy in price so I'm comfortable in beating those ponies with great abandon.
Steve
Steve