Every day there are several major crashes where a car is totaled: cannot be fixed and so the person needs a new one now. There are also a lot of people who wait until their old car breaks completely before deciding to get a new one (the car may or may not be repairable, many people give up on a perfectly good car). Both of these cases are high profit margin I need a car now I'll take what I can get.

Someone who is willing to order a car and wait is more likely to look for a better deal if they can get it.