Not sure about sales, but profits definitely go up, a month before christmas let's say an xbox kinect is 200, with a free game and control, now christmas time, all of a sudden 300 just for the system, then you have to buy the game and control, another 100, the system itself still costs the same, why the price difference? Money. You don't want to be the loser parent, with the loser kid that doesn't have the xbox kinect? So yeah profits go up, sales no. They still sell the same amount of units that were in stores a month earlier, just make more money.