I think they are a bit evil.
My sister and her DH only have a couple of Jamie Oliver books and THAT'S IT. Freaks.
I get a bit twitchy if I visit someone and I can't see their bookshelf, I have been known to snoop on the pretext of finding the loo or something to put my mind at rest.
I think it shows trerrible character and possibly criminal leanings to not have hundreds some books around the house.
AIBU? I know i'm not really, it's just common sense.