The last time I replaced wood to fill a scope side mount hole I charged the client $300 and he about threw a fit!
Took me five hours, almost undetectable, multi-thousand dollar rifle, very fast turn-around... one little piece of walnut was all he could think, I imagine?
Precise work doesn't happen in a hurry and I'd like to make the same $100 per hour that my plumber does.
Mike relates the investment in machine tooling, good hand work doesn't take that much monetary investment, just 20+ years of experience.
Who needs it? I'm not that thick-skinned.