Yes. With PragProg it's 50%, but it's 50% profit sharing really. There's no advance up-front, but you split the profits with the publisher. It's pretty awesome because in a way, it's a lot like self-publishing, but you get all the support that comes from a publisher, including copy editors, indexers, and development editors.

So you can win on that deal or lose. If you sell 400 copies, you'd have been better off taking a $10,000 advance. If you sell 4000 copies, you're gonna be much happier with this situation.