You missed the point. (Score 1)

Sure, sell your painting and your corn and your books. The argument says that IDEAS and THOUGHTS should not be sold - the ideas in the book, the image that you painted, etc. Other painters should be able to paint the same thing, right? Would you like it if someone copyrighted the linked list and you had to pay to use one every time? Go ahead and charge for the app, if you want to, but the ideas for the app should not be protected. Like SSH for Windows and WinAmp, people have gone and made money off of open sourced things.