ok 10 million Subs are people who play WoW(including china) i believe its around 30-40 million people who have tried out wow on trials and such accounts and canceled.
Warcraft Realms is outdated as always and it used to(i believe) require an Addon that the people on the site themselves have to keep on in every zone in every spot of the game to get all the people playing.
It really is a terrible site