I don't claim to understand it -- but it sure is hard to argue with free. InBubbleWrap is a site that has contests you can enter on a very regular basis to win business related books and related materials.
As I said, I don't quite understand what the goal of the site is. But the tone is more of one where business ideas are informally exchanged, rather than a FREE FREE FREE contest site.
You may want to give the site a try and see how you fare.