An interesting side note is that part of the funding for this has been in part made by selling of Japanese government bonds. That's according to the Ministry of Finance.
Japan is treading such a fine line however, you can't sell of bonds too fast here otherwise yields would go up and funding of the country that is so leveraged could blow up.. For now it's "ok".
Interesting to see what the BoJ meeting has to offer, two weeks left of manic price appreciation.
PS: I actually like the thing that everything going up.... 2013 will be the time, to watch for Shorts call :)