Sales /= Demand does not apply to Apple products. It could be they have a "God tier marketing department" as a previous poster pointed out. Furthermore, if marketing was everything, then Kinect would be at the top of both lists due to the sheer amount Microsoft poured in to create the demand. I have to agree that sales /= demand with the exception being a product from Apple.
I think for kids it comes down to what they can fit in their backpack and hide within a book during class. With an iPad, kids and teenagers can surf the Internet or play Farmville with it hidden in their open textbook. I also think the iPad and iPod are more status symbols to show off and brag about during recess.
The smartphone and television set for ages 13 is pretty much self explanatory in that these products symbolize independence during a rebellious era in one's life. With your own television set, you can watch what you want to watch instead of whatever channel dad turns it to while channel surfing in between commercial breaks. The smartphone is there so mom can't pick up the other line and gossip on your conversation.
I am surprised that they did not include "car" on the list for 13 . A car would have placed within the top 10. due to granting more independence from those pesky, boring adults we call our parents.
The Blu-ray player is another status symbol. It is entirely unnecessary with digital distribution via Hulu or Netflix nowadays, but knowing kids, having something which shows greater clarity and produces greater sound in movies is another 1-up on their friends.
As for the rest...meh.
