to the OP: I know that you try to make a point,a valid and true one. The problem is:
*you're just using 2 GAMES as an example
*you're just using 2 SIMPLE UNKNOWN GAMES as an example
*You're missing focusing in one miserable week
*you're cherrypicking and that's never trustful
*You're just focusing in japan whom had different changing tastes
Next time, use more veritable data to support your beloved PSP instead of twisting facts.