Common guys we need not compare sales of previous decades to this decade. Its in the trend... We all know that we felt in first with Christina Aguilera Bionic, Beyonce 4, Britney Spears Feme Fatale.. Those are artist that really sells but did not even manage to sell over 1 million album at the present trend. People tend to download illegaly, Itunes is everywhere. Youtube.. even facebook. We dont have it way back then. So please.. i still consider it as milestone for perry! I love her songs!