^^ Incentives are mostly the other direction. Patients with mild findings have a hard time finding someone to operate on them these days. Colleagues of mine are constantly turning away patients they don't feel are likely to benefit from surgery. Disappointed patients can be very litigious so doctors don't want to deal with someone they think won't improve. Managed care insurance companies also often won't approve payment for procedures without very significant findings. Starting next year hospitals' payments will in part be related to patient satisfaction surveys, yet another disincentive from doing too much surgery. In general these days, it's not so easy for someone with borderline findings to find someone to operate on him.
"Where's the REST of me?"
Ronald Reagan, in "Kings Row"