Why do X360 exclusives sell more than PS3 exclusives?

[binary solo]

PS3 Exclusives:	X360 Exclusives:
	Kinect Adventures - 16.85m Autobundles from day 1 don't count IMO.
Gran Turismo 5 - 7.81m (Racing Sim)	Halo 3 - 11.57m (Shooter)
Uncharted 2 - 5.69m (Action/Adventure)	Halo: Reach - 9.12m (Shooter)
Metal Gear Solid 4 - 5.67m (Action/Adventure)	Gears of War 2 - 6.52m (Shooter)
LittleBigPlanet - 4.96m (Platformer)	Halo ODST - 6.07m (Shooter)
Uncharted 3 - 4.53m (Action/Adventure)	Gears of War - 5.96m (Shooter)
God of War 3 - 4.44m (Action)	Gears of War 3 - 5.51m (Shooter)
Uncharted - 4.26m (Action/Adventure)	Forza Motorsport 3 - 5.09m (Racing Sim)
Gran Turismo 5: Prologue - 4.10m (Racing Sim)	Fable 3 - 4.83m (RPG)
Resistance - 4.07m (Shooter)	Kinect Sports - 4.42m (Sports Mini-game)
MotorStorm - 3.74m (Arcade Racer)	Fable II 4.07m (RPG)

The answer:

2 genres (FPS & TPS) in the top 6 for 360. All 6 games pretty much appeal to the same demographic. It's a Halo and Gears sausage fest.

4 Genres (racing sim, action/adventure, platformer, action) in the top 6 for PS3 all appealing to very different gamer demographics.

Outside the top 6 things start to even out a bit more. 360 still getting higher sales but not massively so.