This has been tried several times. Google Contributor and Blendle are some examples. We had our own. Doesn't work because it's the paying-for-content part that

This has been tried several times. Google Contributor and Blendle are some examples. We had our own. Doesn't work because it's the paying-for-content part that people have a problem with. There's just not enough who are willing to pay the real costs of content. Many even get upset thinking that their internet connection is already "the internet".