I don't know if the math works out- it might not be fair to project full weekend sales based on first day sales.. I think number sold on pre-launch is fairly weighted by the availability. For example, I think many would consider preordering, but only while the initial stock was available. So, say the initial stock last year was about 1 million, and that sold out in one weekend, and then this year, the initial stock was 2 million, and that sold out in a weekend. They both could have had the same actual demand of 2 million, with the available stock determining the actual sales.