For every 100 copies of a physical book we sell, where we have the Kindle edition, we will sell 48 copies of the Kindle edition. It won’t be too long before we’re selling more electronic books than we are physical books.
I’m thinking of putting all the money I get from selling my books on Amazon into a fund to help me buy a Kindle DX. Then I’ll require another fund to help me buy back all my books in Kindle-format.
Via Marco Arment.