Knowing how the car should respond during certain situations, and being able to repeat those situations in a closed course and a learning environment is part of being able to properly diagnose and service such a car. This isn't a Honda Accord we're talking about. 

Subaru’s done the same with the WRX / STi.  They ship the dealership staff out to a track and let them rip some.  Helps the sales folks understand what the cars can actually do.  Also hopefully it lowers the temptation for joy rides to “see what it can do” with an owners car.

I driver the heck out of customer care s that come in my certified Corvette dealer shop. You think we don't burn that rubber and floor that sucker? Thank goodness we have the equipment to erase what we do from the performance computer. Customers never know what we do.

For service members it is great for them to drive the car in several conditions, including track conditions, to understand the feel, sounds, and experience. If a customer comes in with a complaint that the brakes make a funny noise under high speed stopping, they can already have a point of reference for how the…

I actually do think somebody who’s really driven the car will be better at selling it. If nothing else, they’re bound to be more enthusiastic.