In Asia you pay for a short time to spent. More to do in game = more game for Blizzard. So if Koreans would have to do dailies with 7 factions, LFR, Sha, Galleon and two separate lockouts of normal\hc raids, then they will spent more time in game and more will pay for this.
EU\US pay monthly, so the price of spending one week on doing it all and doing just one raid is the same.