I think a lot of people here, myself included, are introverts.

Sitting in front of a salesperson who, if they aren't an extrovert are at the very least required to act like one, for a few hours while they see just how good of a deal they can make for themselves and their boss by talking sounds like a spot of hell.

It's only marginally better than being stuck to someone like that on a plane; at least when buying a car, you can walk out of the dealership.