Sales dosen't reflect demand? Why is that?

[STEKSTAV]

Sure its just apiece of the cake, although 1/5 of the population. And the site also write that this was prior to the $500m advert launch made by Microsoft. But is that it? Or why is it that theres a higher demand for SONY's products among this market segment than the 360, but sales dosen't reflect it at all when it comes to US numbers?

http://blog.nielsen.com/nielsenwire/consumer/kids-in-the-u-s-eyeing-big-ticket-tech-this-holiday-season/