User blog comment:Gilderien/"Wikia" selling 14,381 books of Wikia content on Amazon/@comment-20644-20120305212757

Hi. The source is listed as Wikia, but the company that publishes them is Books, LLC. Wikia is not the publisher of these books. Books, LLC's business model is to publish this sort of content, as they have with other websites, such as Wikipedia. They are within the terms of the CC-BY-SA 3.0 license, allowing them to publish and sell the content. You can read the full license here.

For more detailed info, please see this blog comment by Jenburton from when this was brought to our attention a few months ago.