Just like housing there's ultimately a cartel that limits supply. In medicine some of that limit is justified by preventing the whole field from degenerating i

Just like housing there's ultimately a cartel that limits supply. In medicine some of that limit is justified by preventing the whole field from degenerating into gimcrack quackery, but the limits aren't just around certifications or credentials or experience. They are, as you state, hard limits in many cases designed to jack up prices. With housing the cartels are more decentralized to the neighborhood but the effect is the same. PE gets blamed there too when they're simply taking advantage of the situation to extract some of that rent.