When bad covers happen to good books.

I just have to wonder how some covers make it onto books, and why the publishers think these books will appeal to librarians let alone teens whom are going to read and/or purchase the book.  You would think publishers would want to maximize the potential of a book and give it a great cover so that it would pump up sales.  I know, as a librarian, the cover a book can give me pause as to deciding if I will purchase it or not.
Sometimes the covers look dated already, sometimes the colors are off, sometimes the picture is too flat.  Sometimes it is a mix of all of those and more.
Here are some book covers that just leave me thinking, why?