David Gaughran bring amazing historical perspective:

We aren’t the first to be accused of killing the industry. In 1939, Robert de Graff threatened to kill publishing, too. At the tail end of the Great Depression, when hardcovers regularly sold for between $2.50-$3.00, he started selling paperback Pocket Books for $0.25.

To put that in 2012 dollars, hardcovers cost roughly $40-50. The new paperbacks, the first of their kind in American markets, cost the equivalent of $4.16. In modern terms, a book that once cost as much as a coffee maker now cost as little as a cup of coffee. A book that once cost as much as a full tank of gas now cost as little as a gallon.