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Good advice. The Tbirds and Gt40s come to mind as far as the hype reversing itself.
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They all reverse themself, except maybe VERY limited production cars, like the Enzo Ferrari.
Remember these:
Mazda Miata
Corvette ZR1
Dodge Prowler
PT Cruiser
Honda S2000
Hummer H2
Corvette Z06 (The old one)
Everyone of those was a huge hype at first, sold way over sticker price.......
Then the production caught up, and everyone who had one,
lost their shirt in resale value.
In 99 I bought a 1990 ZR1 from a guy who paid $97K for his new Corvette - car #356.
Price was: Sticker + dealer markup + luxury tax + Sales Tax.
9 years later, I paid him $27K with only 7000 miles on it.

Sold that monstrosity a few years later...
The Shelbys are VERY nice, but in 4 years - They are just going to be another used car.
Hold it for 25 years and MAYBE get your investment back.
Only if they don't sell a million of them. And you NEVER drive it.
This is Just my opinion, there is definitely some value to being the first one out enjoying one of those.
But for $20k over sticker??? "I work way too hard for my money"
I'll be the one buying YOURS in 3 years.

So don't drive it in the rain.
Saw a 2007 GT-H a few days ago - VERY COOL!!!