Are these American stores? Because yes, most American gamers like and buy the 360/Wii because of the culture over here(friends, shows, entertainment, adverts). Sony needs some inroads here. A lot of bitter people tend to try and overlook America because they feel it is undeserved as a center of attention. They play up how important Others and Japan is, but it still remains as true as ever, if you want to gain buzz, you need to be popular in America. We make most of the shows, afterall, and popularity follows the shows. This has nothing to do with pride, it's just a statement of fact. Let me explain.
That's what it comes down to. America's biggest export is entertainment, by FAAAAR. Entertainment is what is popular amongst the core gaming demo. America, arguably, provides more entertainment worldwide, than the rest of the world combined, with our healthy music, television, movie, computer software, and game industries. Apple, Microsoft, Blizzard, Hollywood, rap, pop, the internet and a vast number of its websites(imagine them). We have pwnage entertainment. We do, it's indisputable. America entertains the world. Japan is also a huge entertainment hub, but only to a lesser extent in certain industries like music, computing, internet, and movies. Entertainment is advertisement. Our entertainment exports(Like Japan) are based on our culture. Our culture is based on what our consumers buy. Our consumers are currently buying Xbox. If the PS3 ever catches on in America(which it might never do with sites like Yahoo flaming it in the faces of consumers), then it'll bury the Xbox worldwide.
My logic is fairly sound on this, so watch the knee-jerk reactions.
The trends follow the entertainment. The entertainment follows the culture of the entertainers. Ponder it.
Why do you think we care so much that Ellen or Oprah are playing Wii, or that The Today Show had a PS3 flame on it?