The price will go up as the availability goes down. If you have a shortage of mechanics, each mechanic can raise his/her labor price. So, while you're saying "we can't get <profession> for cheap" this implies a lack of professionals or a structural problem increasing costs in a given industry, or both.

In the case of doctors and electricians, you have structural problems in both, but also a true shortage of individuals in electrician work (could be in the medical field too, but I can't speak to that).