Our dear friend Tobold has an interesting post about WoW’s subscriber numbers surrounding the expansion. WoW repeats the same pattern of other games, just on a grander scale:
So the decline doesn’t matter? Far from that. We will never know the exact numbers, but the WarcraftRealms graph suggests a 10% decline from the peak in February. That still leaves more players than WoW had in December last year. But if you happen to work in a company, imagine you having to tell your bosses that you just lost 10% of your customers, starting the first decline after 27 months of growth. Big as WoW is, losing 10% means losing more people than Everquest ever had, and it also means losing over 100 million dollars.