Jason, I am 28 years old and already did own a supercar. I personally believe that it will be more like 20 years before we see a possible "decline" in interest in these cars. I personally do not know a single person (outside of this website) near or even close to my age group that would spend $100K on any old car. I personally wouldn't do it myself. That is why I say I will never own a supercar again (at least in the next 20 years that is!
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I think that the guys my age that like muscle cars would rather have a cool AFFORDABLE Chevelle, Camaro, or Nova. In my experience they are not that interested in #'s, broach marks, whether it has spiral shocks, or the "correct" chalk marks on the firewall. I believe that they are more concerned with a good looking great running American Muscle Car.
Most of you guys forget that most of these cars are "niche" vehicles and are mostly out of reach or just don't appeal to the masses. If they did I guess that there would have been more built. To prove this look at the membership of this website for the purpose of general interest at almost 3800 members as compared to LS1tech.com at almost 71,000!!!!
Don't get me wrong, I LOVE these cars. They are definitely an acquired taste. That is why I am here as well as everyone else I assume. The moments that I had in my supercar will never be duplicated or forgotten as long as I have breath in my lungs. If everyone could be so fortunate.....