Not everything makes sense to put out as Creative Commons. Sometimes you want to actually sell something like software or an ebook, but you don't think it makes sense to go after people torrenting your stuff and giving it away for free.
My philosophy is there can still be an exchange of value. So, with the Pirate License, you make a version of your product explicitly licensed under the Pirate License which calls those who steal your product pirates, and asks them to pass it along to other pirates or potential customers.
I think it makes the expectations for piracy much more clear and should lead to better outcomes.