Why is the PSP lowering in the US and Others and rising in Japan?

[Sky Render]

There's a lot of possible reasons. One suggestion is that Japanese gamers are replacing their PSP original models with PSP Slim models en masse. Another is that pirating of PSP games has taken off in Japan. Still another is that the failure rate of early PSP models is catching up with them, and users are replacing their systems for that reason. It could even be something else entirely from any of those, for all we know.