I mean take someone like Martin Fowler who wrote a number of highly influential book and a great website. Every time you look for him, you'll find his company or employer, ThoughtWorks. He and his work have put that company on the map as one of the top consultancy firms; he and his work educate everyone that works for that company, they follow his teachings and mindset, and become "10x" because of it.

Companies would be DESPERATE to hire him. Maybe not the kind of employers you think of, no, and maybe you wouldn't hire him for his 'output', but that's a very superficial way to look at it.