I can't speak to the author, but I have a loved one with a serious skin condition who has tried just about everything under the sun. Only recently have they found an ointment that works and it is ~$70/oz. Not all anti-fungals are created equal.

As with antibiotics, OTC anti-fungals are often ineffective due to resistance from over/improper use.

If that's the case then it sounds like a higher price is a good thing.

No, that's why we have prescriptions, and education for doctors and patients on when to get one.

Making them expensive means poor people don't do their full course of treatment because they can't afford it (or want to save some for next time), increasing resistance.

Antifungals are like antibiotics or insecticides, in that the pathogen can develop resistances. Also the mechanisms of action differ (again, just like antibiotics or insecticides).