They legitimately don't mind at all if people do things like this, however silly they seem; if they did mind, they could've set things up under a CC-NC license instead, which does restrict commercial usage. Wikipedia and Wikia both made the explicit choice to allow anyone to create a commercialized work from their sites.
"Silly" doesn't even begin to describe what I would call this, but if it's legal...I guess there's nothing that can be done. Except spread the word.