ERS auto renewal question for Marcus/designee

Not a Clue wrote:
I could have sworn that I received a mailer a couple of years ago that indicated that if I set up auto renewal my rates would not go up.

While there is a cost in procuring new customers, there is no cost in retaining old customers. Why, then, would an organization build in a cost factor to retain an old customer, when that cost could and should be shifted to obtaining new customers and growing a business