And when you get into high end sports cars, that's the case. Unfortunately, in the economical car market, people are looking at the bottom line: price. The salesman at Lot A can explain that his car is more expensive because it has X tires, but for a lot of people that means nothing. As far as they're concerned, tires are tires, and that's the end of it.
The best option would of course be to offer different tire options, but that's difficult because it means you'd have to order the vehicle.