I suspect more $100k cars don't get used on the 450 mile journeys. They're certainly far more common in the city than on the highway between cities. A $100k car is a very different market than a $50k car.

What is interesting, though, is that at least in Los Angeles pretty much every other car in the $100k range is a lot more common than the Roadster. I think I've seen one once. Even considerably pricier cars are more common than that.