Amazon sells digital goods. Lots of them: E-books, audio books, instant movies, online games, software, and now mobile apps. The digital goods that fly off the virtual shelves the most are those that can be easily purchased from the platform on which you consume those goods.
The Kindle was the first e-book reader to make it so ridiculously easy to buy and download digital books that the uptake was huge. Most readers who developed the Kindle habit increased their book purchasing metabolism by 2x to 5x. You don’t have to think about it. You’re reading something you like, and you just buy another book (or books) by the same author. In my case, I find prolific authors and I buy their entire works and read them in order. (I recommend Anne Rivers Siddons—an amazing writer and a satisfyingly prolific one!)
E-Books Sales Are Soaring. Spurred by the popularity of iPads, Kindles, and other e-book readers as holiday gifts, e-book sales (across all publishers and platforms) increased by 116% in January 2011 to $70 million. During the same month, adult paperback book sales dropped by 20%, and adult mass market paperback book sales dropped by 31%.