I agree with what you're saying. I was just trying to point out that strict education requirements (e.g. state regulation of the profession) do influence wages within the profession. Parent made a point about PhD waiters being paid the same as non-PhD waiters. But that is only true because restaurants have no requirement to employ advanced degree holders. By contrast, in Law and Medicine, you are legally required to have that education. The pay difference there is huge: a lawyer with a JD makes much more than lawyer without a JD. Because you can't even be a lawyer without a JD (under most state law).

My point is about the relative pay within a profession, rather than a profession relative to other professions.