1. Microsoft got their big game out much sooner which skews the top end of the graphic considerably. If Sony hadn't arsed around and released GT5 last year or something it would have looked different at the top.
2. Microsoft played a better game before the generation even started and secured one of the biggest new I.P releases and got it within the first year after release I.E. a little luck and a little preparation.
Otherwise the sales look fairly standard below that level as per number of releases etc vs number of million sellers. Theres no point in looking at the top level of sales, the median/mean numbers are far more interesting and you want to avoid obsessing over the above outliers because they are deceptive and statistically unreliable.
Tease.
