My experience
I bought my first new Vette in '04, a base MY 2005 coupe. The sales guy had been dealing with Vettes for over 30 years and knew the product completely. Sadly, he has moved away. He was at Maxy Price in GA. Hendrick in Atlanta has now far surpassed Maxy in number of sales in the SE. Neither seems to have people who know the product well enough to answer simple questions. I think it is my understanding that for each Vette sold, the dealer is able to receive an additional 1.5 cars. Also, they have to maintain training specifically for their techs on Vettes. It is the techs that should know the product better than the next guy or the sales people. My current C6 is a 2006 Z06, VY, of course! The C7 will have to be something really really special for me to part with my 427.
Frankly, I do not know how a dealership would be able to remai viable selling only Vettes and still maintain a cadre of trained techs to service and repair them. The present economy would be devastating for them I would think. :ugh