And you also have to consider the amount of money they put into their tools too. Mechanics need to be holding tens of thousands of dollars in tools, they aren't given tools by their employer to use. And if they work for more than a few years in that job there are health issues that arise. My mechanic father for example needed both shoulders replaced, has nerve damage from tool vibration, and his hands are basically permenant claws that can still pull a wrench but prevent him from opening a jar or bottle of pop without a tool to help grip it.