That doesn't mean the market values such effort. They have no right to demand to be paid just because something takes skill. Lots of skilled activities are of no value to the market. And I say this as a musician who's very aware of the effort involved.
Not necessarily. They can of course charge before demonstrating said skill, but if someone else happens to be witness, or copy the output in some way, it doesn't mean he controls all future uses of the result of said skill.
