wfz on 04 September 2010
IMO, attach rates are bogus to go by. The larger the install base, the less attach rate the same type of game would have. The amount of new costumers you gain are not percentage-wise the same amount of FPS fans as your original fanbase. I don't think using attach rates will create any sound base for sales projections.
That said, I do expect Halo Reach to outsell Halo 3 easily.
