That's a whopping 0.34%

I was pretty surprised to discover in @U2's 2006 Fan Survey that 17 people actually said that Get Up Off Your Knees: Preaching the U2 Catalog was their favorite U2 book (out of 38 possibilities). (I don't remember what I voted for; perhaps Bono: In Conversation?) We beat things like Race of Angels, The U2 Reader, and perhaps most blasphemously, Bill Graham's The Early Years.