You touch a point that has been discussed ad-nauseam before (I saw it in /. a long time ago): Why should artists be perpetually paid for the 40 hours of work

You touch a point that has been discussed ad-nauseam before (I saw it in /. a long time ago): Why should artists be perpetually paid for the 40 hours of work they made? Any normal people, has a pay rate (minimum $0.77 USD/hr where I live). Someone goes to work, works for 8 hours, and gets their 8hr equivalent salary. But then you have "artists" who work to produce their product for say 80 hours, and then they want to be perpetually paid... not only that, they want to be paid enough to live a lifestyle similar to the person that get's paid for 40 hours a week job, for 30 years.