If the cards that used to come in the backs of books are any indication, 26 checkouts for a single book is way too low. It wasn’t uncommon to see a book with the front and back of the card filled back in the day, and our library just used little datestamps (from an ink stamper!) to mark them, so it could get several on each side of a card.
Harpen Collins is hardly a neutral voice in the ebook lending debate too. Most of their arguments can be boiled down to “we want more money”. I laugh at the “undermine the emerging e-book eco-system” point most of all, because big publishers like HC have been doing that for well over a decade now and have only recently started to realize how futile it is to fight the future.