That means there's an opportunity / gap in the market. Demand for risky operations by motivated buyers, should lead to some doctors taking on the role / label

That means there's an opportunity / gap in the market. Demand for risky operations by motivated buyers, should lead to some doctors taking on the role / label of risk-takers / explorers. Since they can get the customers other, risk averse doctors are turning away, and pull in rare-treatment seekers on their own.