The curious thing about the $400 bundles is that because they have games they can sorta give away for free, AND 500GB extra HDD space isn't very expensive it's possible for MS to do $100 off every boxed bundle as BF and holiday specials. If they only really care about winning NPD in Nov and Dec then that's plenty enough for them to get those wins.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix