I wonder how the cost of ownership breaks down over time.

A library pays $15 for a physical book that requires re-shelving, index cards to be made and kept up, time spent searching when someone misplaced the book, floor space, shelving, off site storage, etc.

There's cost for storing ebooks too but a couple of Dell servers and a backup provider could handle even a fairly large library with less labor (probably the highest cost).

I don't know much about the library world so maybe $78 for an ebook is terrible but owning a thing isn't a fixed cost like the article pretends it to be.