Patron comes in to renew book for son.
Patron: How much are books here?
Me: The books in our Used Book Nook are $1 for paperback and $2 for hardcover.
Patron: But you can’t buy this one? (holds up renewed library book)
Patron: Oh, because my son is going to need it for a while…
Me (Thinking): That’s what bookstores are for.