Diablo 3 population drops drastically

It was reported to game statistic companies that Diablo3's population took a massive hit again... already losing around 30% of the population in the first 30 day's, more recently it has been reported that Blizzards Diablo 3 lost 60% more of there population. anyone know more about this? I know the game isnt much fun after you max out your character, but 60% is huge drop for any game.