The only thing I could think of is letting the less informed parents know of the game maybe before their kids do. But since most uninformed parents don't visit here often, they wouldn't see it. The other reason is the game specific sections have not been brought online. Plus, if you see my last five played. I am not a big fan of the COD series. I like Ghost Recon, Rainbow Six, Battlefield and Medal of Honor a lot more. They are a much better product than this COD shovel-ware that comes out every 9 months.
Oh, there is the other reason Activision wants to have a COD baby. So, in a long stretch it kind of has something to do with Gamer Parents.