Given the way that insurance companies have inserted themselves between prospective customers and repair shops, one of the easiest ways to guarantee a steady flow of work is to enter into one-sided DRP contracts. But what often happens is these contracts take away pride in workmanship in trade for a fistful of dollars and added liability risks. Given that most shop owners don't know anything about contract law, insurance companies have found it laughably easy to turn shops into puppets that willingly perform barely adequate repairs while assuming full liability when something goes wrong.
Even though my shop may never have the throughput of a DRP, we always maintain the right to approach vehicle repair on our own terms, and we never forget that we work for the customer, not the insurance company.