David Wiley has posted a lengthy response to a post written by Stephen Downes in December. Wiley and Downes have had fundamental disagreements about Creative Commons Non-Commercial clause and have exchanged posts for several years on this topic. From the post:
For commercial entities who produce their own content and want to share it, and whose continued existence depends on their ability to protect themselves against being undercut by another commercial entity, I think the NC clause can make sense. I guess to me the very odd beast that is NC only makes sense in the case of the very odd beast that is the commercial content producer who wants to openly license their content.
Downes also covers it on Stephen’s Web.