Japan sales comparism 2nd week of December 2002-2007 (PS2+GBA vs. wii+DS)

[Bodhesatva]

Several reasons for PSP sales have been hypothesized:

1) Pirating
2) People upgrading to the slim model
3) People using the system as a portal media device and not a game player
4) People taking the PSPs to other parts of Asia

I expect it's a combination of all these factors.