[BuildTheRobots]

It's more than just production, let me highlight storage and transport costs too (having just moved house with tonnes of books it's very much on my mind).

There's also longevity, which ties in with search-ability. Modern paper even under the best of conditions only has a century of shelf-life, where as digital data should persist for forever. Also as it's digital we get the benefits of flowing text, searching/indexing and easily converting to new formats and even languages - and the ability to easily update these conversions as technology progresses.

Theoretically (on paper?) digital books have all the benefits in the world. As a book lover I still can't quite get on with them in all but the trashiest of uses.