Longer and longer crime fiction?

As part of my weight training program I lifted four books I intend to read over the next few weeks [ authored by Jo Nesbo, Leif G.W.Persson, Hakan Nesser and Robert Harris] in order to photograph them with a few older books authored by people who also sold a few books in their time. 

With the Man Booker Prize going to young Eleanor Catton for The Luminaries, a nineteenth century murder mystery, that weighs in at 832 pages I wonder if this is all part of a cunning plot to sell Kindles, and other electronic reading devices. Readers faced with such huge books will have no choice but to download an electronic version, or face permanent wrist and shoulder pain.