$10 says he walks out of the finance office with an upgraded warranty package, gap insurance, and an upgraded roadside assistance program that also offers motel and rental car coverage. Shaving that $1,000 off the invoice only cost an extra $4,000.
Those finance people are trained to SELL SELL SELL. If you buy this, then we can accommodate you on that, which overall is a fantastic way to save money and get better coverage. The only reason we are able to offer you this great discount, is because you are a new customer, and we just happen to have this one last form leftover from a promotional. This isn't even supposed to happen, but because of what is technically a clerical error, you have a great opportunity to take advantage of the additional savings.