You Can't Judge a Book by the Cover

"I look like a farmer, but I'm a lover.
You can't judge a book by looking at the cover."

I don't get it - farmers can't be lovers?
And as a graphic designer I frequently judge a book by its cover. If you can't invest in a decent designer for your book cover - well that does say something about you and about your book now doesn't it?

song: You Can't Judge a Book by the Cover • artist: Bo Diddley