Quick comparison of “Hours Played” from XFire for some MMOs, and a ballpark estimate of subscriber activity, given a baseline of five million active WoW players in North America and Europe:
GameXfire HoursRankEst. PlayersWord of Warcraft40657215000000Guild Wars303937373771Maple Story1214619149370EVE Online1174620144451Age of Conan969028119167Lord of the Rings Online852529104839Lineage II69733385753Star Wars Galaxies45454555894Second Life42244851946Final Fantasy XI38275547064City of Heroes25517831372EverQuest II23728729170Pirates of the Caribbean Online155110819074Tabula Rasa135611616676Warhammer Online127012115618Ultima Online97114011941Anarchy Online88114910834EverQuest7291618965Dungeons and Dragons Online6941678534Dark Age of Camelot6451767932Saga of Ryzom5801877132Vanguard5621906911City of Villains4282155263Pirates of the Burning Sea3952274857The Matrix Online3352404119Planetside3132463849Dungeon Runners2332752865Asheron’s Call1873012299