Because the formula you refer

Because the formula you refer to WOW TBC Gold is simple and loose It was designed to be obscured by the social interaction which at the time was quite unique. It almost always had an impact on the participants. They were adding an extra layer of mystery, I believe.

Truth. This is the way sub-games operate. It rewards you with long hours that will keep you on the path to success. This is the thing I find the most fascinating about Ffxiv. They design it in an environment where there's very little time gating, and have explicitly stated that it's acceptable to unsubscribe during content droughts, and that you're unlikely to be very far behind. They are more concerned with the time of players more than the amount of time they spend. They also know that quality content is the only way to increase number of subs. If I had the chance to play in buy Burning Crusade Classic Gold Azeroth however, with Square Enix as my boss, I'd probably be fan of games all over.