When I was in library school, I had a WONDERFUL children's literature professor who one day went on a rant about not buying what I will refer to as "junk" for our libraries (she used a more colorful four-letter word). "I don't want to see any [junk] on your shelves!" she told us. "There are too many good books out there for you to be buying [junk]."
By [junk] she meant books like these: