Judging a book by its cover

Yeah, yeah. We all know the saying. You shouldn't judge a book by its cover. The thing is, it doesn't always apply, especially to books. Also, they may not have said it if they'd had access to photoshop waaay back when.

(This was probably pretty close to 'state of the art' back then.)
Today, we can make covers that show anything and everything, from dinosaurs and aliens, to spaceships and machines which conform to no known laws of physics, and in this age of self-publishing, you can certainly j...