Re. mechanisms for paying authors and musicians (and other creatives) without Copyright or Patent law, take a look at that Molinari site. History is replete with examples.
Furthermore, even if your argument were correct, it still wouldn't justify the initiation of force inherent in Copyright and Patent law. That is, the desire of authors to earn a living from writing ought not to be sufficient cause for the State to coerce people into paying them for their writing.