CA is not an indie company, they have truckloads of resources, and a juggernaut like SEGA backing them. At this point, I believe that the only reason for pre-orders to exist is to appease investors with early "interest indicators", since I don't think big companies really need the extra income 6 months in advance. (I would have normally also added that they are used to sell games before reviews, but since CA has had the guts to lift the review NDAs a week before release, you won't see me criticising them there, they deserve their due credit for that).