I spend 50% on things that make my life less annoying while at work. That might be research that is vaguely related to work but entertaining to me or it might be writing automation tools so I can work less. I have never given someone else my full effort. Except my spouse of course.
This is an interesting perspective. I've seen both sides of the coin.
I've personally had hard work pay off significantly and at the same time it is what I wanted to do personally to challenge myself. I didn't have to.
I've also seen incredibly hard workers lied to and promised things only later to be told did you get it in writing?
It is hard to have your perspective when the job is menial, imo. Not a ton of personal growth as a garbage man or general laborer.