I have raised this question, and got one interesting answer: 'should obama get money for every newspaper story about him?' However, I don't think that's a good analogy. I would personally think writing a book and getting money for it is more analogous to having a paper that you fully wrote on your own being published is a better analogy. the publisher is always somebody else, so why doesn't one get money for a publication with scientific articles vs a book? Perhaps these journals require much work for peer-review and thus demand more money?