I understand your position.That's the caveat. If I don't factor in my time, which does have value regardless of the type of time, I've made a lot of money on everything I've ever sold. Time spent making repairs or the like is time not spent playing drums, camping, spending time with family etc. therefore, it has a value that needs to be factored in to the overall equation.
If your time has no value to you whatsoever, bully for you, but I have many things to do with my time besides fix stuff and watch TV so I assign it a value.