You find it hard to believe that 72% of the games audience has played the game online?
That really isn't that hard to believe seeing as how the game automatically connects to the online server when the game is turned on, provided of course that you made a PSN account. So you don't really choose to go online, your always online.
If that is true, then there must be something wrong with what someome has quoted, or been quoted on.... because 17,000 hours of play is a tiny tiny amount for 1.3 million people. In fact it is only about 10 seconds each.