It's sound if you assume both aren't part of the job description. Change the occupation in the poorly constructed analogy and we have...

Suppose a pilot has a choice of two activities:

1. Read FAA safety report, unpaid 2. Fly plane, paid

Doctors, especially at academic institutions, are required not only to be up to date in the latest research, but contribute to it. If a doctor treats a patient in a way not up to par with current practices in research, he will be sued and lose his licensure.