Yes, empower the content consumers, let them choose how much they give away. What is the minimum you think?
(yeah pretty sure I flipped your whole 'thing' and served it up to you, not sorry either as it wouldn't make any sense that the author should decide how much the curators earn, after all, it's like the consumers deciding how many words any one post should be, and if you didn't mean it like that, then I couldn't agree more, maybe a min 10%)