Is it possible to own too many books?

This piece on the Guardian is a few months old, but I think about it often:

You be the judge: should my wife clear out her old books?

Here’s the precis: Andy says he wants his wife, Sally, to get rid of some of her old books because she keeps every book she's ever read, and they clutter up the house and gather dust, and there's no reason to keep so many books when they have access to a library and audiobooks/ebooks. He thinks Sally should adopt a one in one out policy.

Sally says no, she’s going to...