Just spent the afternoon basking in a little garage therapy, changing the oil in my mighty GT, and thinking about this very subject.
Here is the equation: Mid engine exotic+ built in America+great racing heritage+easy to mod+ 200 mph right out of the box +jaw dropping, eye popping styling + only 4000 made + great community of owners = cars that will only become more valuable as time passes.
Ah, its great to be a GT owner!
+1 Everything I've read puts the FGT at the top for a collector car for the average guy. I think it was Car @ Driver rated the FGT #1 and the Mitsubishi 3000GT as #2 for collectability. I'm sure they are not in the same league as the 1 of 4 collector cars, but those aren't for the average guy.