Patricia C. Wrede said this quote
“ (In reply to the question, 'Would you like some suggestions for a plot for your next book?')There are three problems with getting plot suggestions from other people. The first is that ideas are the easy part of writing; finding the time and energy to get them down on paper is the hard part. I have plenty of ideas already. Which brings me to the second problem: the ideas that excite you, the ones you think would make a terrific book, are not necessarily the same ideas that excite me. And if a writer isn't excited about an idea, she generally doesn't turn out a terrific book, even if the idea is terrific. And the third problem with my using your suggestions is that, theoretically, you could sue me if I did, and that tends to make publishers nervous, which makes it hard to sell a book. So thank you, but no. ”