[Steve Chryssos]

I think of the distinction in terms of a sliding scale:

<<<Grand Touring on one end; race-car-for-the-street on the other>>>.

A good example of an OE Grand Touring car is a Bentley Conti GT. Grand touring cars are expected to deliver comfort and effortless performance. There is nothing easy or comfortable about race cars for the street. They are raw and unfiltered. As long as that is true, the majority of enthusiasts will lean towards the GT end of the scale. It might not look that way since cars like F-Bomb and Rupp's Camaro are presently in the spotlight. But these cars will continue to occupy the minority.
And as stated, don't think these cars are much easier or cheaper to build. For example, large sums of money were just spent to have TLT Racetek convert the Libby Fairlane to dry sump. Dry sump is, in itself, expensive. Try to seamlessly integrate a dry sump system with AC and a serpentine system and the costs go up exponentially.

There simply is no part numbet for the conversion. So the majority of enthusiasts will continue to take the path of least resistence. And that means GT cars.