Wow. You almost never see a debate as good as the one below when it comes to copyright (indeed, when it comes to any topic). Most discussions about copyright flounder in the very definitions of terms: "Unauthorized copying is theft!" "No it's not!" "But they're stealing the money they never paid me!" "If they didn't agree to pay it to you, how can they steal it from you?". And so on.
That's why it's such a pleasure to see a debate about non-commercial restrictions in licensing where both sides have clearly thought deeply about the issues and are careful to stay intellectually honest even while disagreeing. Recently, author Cory Doctorow and animation artist Nina Paley conducted a long email exchange about the Creative Commons "noncommercial" licenses versus the Creator Endorsed Mark. Afterwards, Nina edited down their discussion and posted it, with Cory's permission. Both the discussion and the readers' comments afterwards are well worth a look. I wish all discussions could be like theirs.