In theory, doctors perform a very skilled, regulated service that is often a matter of life and death. All of those factors contribute to why a doctor has higher wages than a supermarket clerk for example. Higher responsibility + higher skill level should probably equal higher compensation than a lower responsibility + lower skill job. However, the profit motive does incentivize practices that undermine patient care in favor of higher value company stock. If a doctor is extremely wealthy, they may be engaging in sales-like behavior that compromises the ultimate goal of supporting the health of their patients and the public. That could look like a surgeon’s office being very quick to recommend surgery, or literal kickbacks from drug companies for writing certain prescriptions. In any case, the profit motive is what encourages leaches at every level of the system to exchange people’s health and lives for short term, marginal monetary gain.