Price may not be that crazy assuming someone wants that car.
The owner says there are $25k of factory upgrades. A fully loaded GT Premium convertible stickers at just under $50k as built on the Ford site including Brembos, etc. So if most of the $25k added is for supercharger, etc, then this car might have a theoretical sticker of $65-$70k & could have sold for $60k new.
Granted I don't know anyone who would want those stripes or be willing to spend that kind of money on such a car instead of buying a GT500, etc, but it does not seem totally crazy.
2013 GT Premium Convertible
Sterling Grey/Saddle Interior
Automatic/Brembos/Shaker Pro Audio