Patients tend to give doctors higher customer satisfaction scores when the doctor writes a prescription, regardless of whether the patient really needs it. Patients like to feel that the doctor is taking their problems seriously and doing something. This is one of the negative aspects of moving to a more consumer-driven healthcare model. Providers try to optimize their customer satisfaction scores to bring in more business, and large provider organizations sometimes use those scores as one factor in paying doctors.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3581314/