This is a pure guess, but one of the things a buisness would get out of a mail-in rebate scheme is a customer's contact details, for future marketing (or even t

This is a pure guess, but one of the things a buisness would get out of a mail-in rebate scheme is a customer's contact details, for future marketing (or even to sell on to other companies). Of course, along with the information that "this is the kind of customer who takes part in mail-ins". That kind of thing can be done far more cheaply, and far more effectively, online these days.