I know it depends on the book and it's condition, but what do various signatures add to the price of a book? A CoH signed by Christopher Tolkien and Alan Lee just sold for $300 and I've seen one with just Alan Lee for sale at $99. The book itself isn't expensive as many were printed and they are readily available. No more C. Tolkien autographs coming of course. J.R.R. Tolkien obviously the same. Thoughts on what to pay for some of these signatures?