I don't think they're keeping books because they don't have any - or at least, not most of them. They're keeping them because the books get lost under piles of stuff and they can never find them when they're thinking about them. Out of sight, out of mind, so the books never come back.

We don't even have study hall, and I don't want volunteers who have a beef against me for making them be there. More trouble than it's worth.