a lot of cars are leased and it's a business expense for a lot of people. They want to get into a car immeidately and at times there are special incentives. The incentives do not apply to the ordered cars as it is too far out and incentives will expire by then.
yes, i see the point of saving, but I know a lot of people make more than 2.5k net a day. So for them to sit in tiny airplane ride to pick up a car makes no sense. I have done few ED and would do it again, but not all times you come out on top. That's all. It's business 101.