The going theory is that Nintendo's stocking up for the US release of SSB:B. Which has some merit, really; it's basically their most hyped game for the Wii. Given how many systems they're making a month, factored with how many systems they have put out on shelves the last six weeks, it's a safe estimate that there should be between 300,000 and 500,000 Wiis available new for sale in the US during the launch week of Brawl.
Sky Render - Sanity is for the weak.