"Big but Navigable" doesn't seem to be ordering very many books in hardcover all of a sudden. Particularly in literary fiction (the stuff you might want to buy and keep) every book on every shelf was either a trade or mass-market paperback.
Maybe it's just my particular store, but I found it intriguing and would hasten to assure all and sundry that we enjoy stocking and selling hardcovers as well as paperbacks. When it comes to building a home library, they hold up much better and, of course, nothing furnishes a room like books!