The example I gave was a cure for hepatitis C, not a baldness treatment.
What you're suggesting is limiting the upside for investment. How do you think investors (the ones giving money to develop a drug) would react if you told them that the best they can do is a 2x return on their money when before they could get a 5-15x return?
That would likely mean fewer baldness treatments, which I'm fine with. What's unclear is whether we'd get a more socially optimal investment level for DALY improvements. I tend to think we would.