K. K. Rowling writings have become the benchmark for developing fictional stories of times gone-by in the 21st Century. Interestingly enough, since the invention of the movable type press by Gutenberg in Germany in 1463 or thereabout, books have had value. And this fact has not changed even with the advent of the internet and electronic devices such as kindle.
Harry Potter and the Philosopher's would fetch more as buyers decide to auction their acquisitions.
Will you edit that to J.K before the spellcheck assholes show up. Please..