This article highlihts the dis-proportionate amount of revenues advertisers pay for "premium" demographics, noting that the USA yields ~$2.2 cpm and ROW around

This article highlihts the dis-proportionate amount of revenues advertisers pay for "premium" demographics, noting that the USA yields ~$2.2 cpm and ROW around $0.30 cpm. This is a 7x multiple or premium for a USA user. It also raises the question of ultimate growth potential: the low value category are 3x more plentiful than the premium one in terms of subscriber base (and presumably growing faster, too).