It’s very telling to see someone extraordinarily popular, extraordinarily widely-read, and with a great deal to lose, put his own works up on the internet for free as an experiment, and change his mind about piracy when the empirical evidence proves his original thoughts on the matter wrong.
Just yesterday, I bought a copy of Watchmen — my first ever — despite having read it years ago. Why would I have bought it, if I already know the story? If I already read it for free once before? Because the content is worth it to me, and I never would have known that for certain if I hadn’t read it first.