Cornucopia of the Commons

I have always heard of the tragedy of the commons, where people act in their own self-interests with public resources, such as air and water. This article, however, introduces a new concept, the cornucopia of the commons. Many great things were mentioned, such as Wikipedia, shareware, and blog writers, that contribute and help the public, at no cost (currency-wise, not counting for time). It is so cool how people will come together to create information and programs that will help complete strangers for no pay. They get a satisfaction of expressing themselves and a feeling of charity, but other than that, nothing. It's nice to know that there's still a lot of good people out there.