Don't judge a book by it's cover

People tell you not to judge a book by it's cover. I've gotten a number of books where the cover has absolutely nothing to do with the story line. You just know the artist never read the book. Might not have even read the summary. I frequently feel bad for the author knowing that this person who's had nothing to do with their creative process may have sunk their book. Or worse gotten people to read it who had no interest in the actual subject. Problem is even though I know that these two people probably never sat together over coffee and talked about ideas sometimes I decide not to read a book because of it's cover. Should publishers take more responsibility for making sure that the cover matches the story line? If the publisher doesn't particularly like the story should they fluff the cover so that it sells better then it should? I happen to think that the artist should read the book first. At least talk with the author.