Cory Doctorow is the author of Down and Out in the Magic Kingdom, Overclocked, Stories of the Future Present and other interesting books.  He radically affected my thoughts on copyright and what is possible in a collaborative medium.

His article at Fortune called Giving It Away explains his thoughts better than I can.

Most people who download the book don't end up buying it, but they wouldn’t have bought it in any event, so I haven’t lost any sales, I’ve just won an audience. A tiny minority of downloaders treat the free e-book as a substitute for the printed book--those are the lost sales. But a much larger minority treat the e-book as an enticement to buy the printed book. They're gained sales. As long as gained sales outnumber lost sales, I'm ahead of the game. After all, distributing nearly a million copies of my book has cost me nothing.

This is one big part of the future of RPGs. There's too much stuff that needs to be written than any publisher can afford to pay for in time to have it to market when it is needed.

Here's another good article on the topic.

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