User blog comment:Damac1214/Sales of Black Ops II are a "Cause of Concern" for Activision/@comment-5086876-20121202220504

The reason it dropped is because of all the other games that released at the same time. This year: Assassin's creed, Halo 4. Last year: BF3. Two years ago: nothing(only Halo reach 2 months earlier). You have to look at the sales in April or May to see if the game sold succesfully.