I Don’t Understand eBook Pricing

I’m ready to buy an eReader. I don’t want to haul around a bunch of books. I don’t want to keep finding shelf space in my library (or beside my bed). And I tell myself that in the long run, I’ll save money.

But pricing like this baffles me.

Can anyone explain why an eBook costs more than either a paperback or a hardcover book?

In case you’re curious, the book is The Invisible Gorilla: How Our Intuitions Deceive Us. Coincidence?