Why do dealerships lose/destroy vehicle records?

[Ryan T]

I asked the guys at the dealership I'm at now and they said they throw them away to try to get customers to continue to get service work done at the dealership they bought the car from. They don't want you to buy a car at A.B. motors and then give you a bunch of service receipts from C.D. motors stating the price they charge for service, what their services entail, etc.