How many MMO subscribers are there?

27 million.

Graphs MMO Revenues, issued by Today’â„¢s Gamers, presents data on 6 countries: USA, UK, Germany, France, Belgium and Netherlands. Altogether, there are nearly 27 million MMO (Massively Multiplayer Online Game) subscribers. World of Warcraft, the most popular MMO, has 11.5 million subscribers world-wide (source: Blizzard Entertainment).