Some Kindle Books Are Not Available in Japan

I love my Kindle.

I read more, especially on business trips. I do all I can to carry less when I travel, so carrying a book always seems to me like a burden. With Kindle, I could eliminate the problem. Fixed (rather small) size and weight and can carry many books.

Yesterday, I was surprised to find that not all Kindle Books are available to me, since my kindle is associated to  my Japanese address. I am thinking very hard, but still can’t find a reason.

If I can purchase the book (Hardcover) from Amazon and ship it to Japan, how come I can’t buy the Kindle version and receive it over a Wireless connection?

Amazon Kindle Japan Fail