Foreign people don't wanna smaller laptop or tablet

If you see both sales ranking of amazon.com and co.jp, you can find each tendency:
In japan, netbook or other smaller laptop is popular. on the other hand, Bigger and
high-class laptops are popular in America.
 I believe that popularity of netbook is grobal phenomenon. But result is different.
Perhaps, In America main transportation is car: easy to bring even if it is a little heavy, but Japanese main transportation is train : congested, crowded, and no one
wanna bring heavier one!