Lol, do you realize that there are players who have 15 characters? All it takes is one +2 key on every character
over several months.
If you think there are 2.4 million players because there are 2.4 m characters on raider.io I have a bridge in Alaska to sell you.
This is a more accurate look at the actual player numbers:
http://www.warcraftrealms.com/census...ervertypeid=-1
Retail WoW is as good as dead. The actual number is most likely slightly higher, as there are some servers that are so dead that no one bothers to run the census addon on them. Imagine that.