What? The doctor’s visit is the cheapest part of healthcare. Procedures cost far more, and pharm far more again. Perhaps you’re outside of the US, though I can’t think of a country where this isn’t true.
Don't forget diagnostic scans and tests. Those are quite expensive. However GP is proposing a service that doesn't actually exist now: paying a medical expert to spend a lot of time considering a challenging case. It would have obvious benefits, so we shouldn't dismiss it out of hand just because it would be too cheap.