The fact is, why buy a PS3 at the moment?
The Xbox 360 has just as good (if not better in many games) graphics, costs LOADS less money even than the BASIC PS3 system and has a large and excellent range of games. PS3 has vey few games, none of which I would call classics.
I played Motorstorm in a store for a bit and was considerably unimpressed. RFOM is poor to be honest, and it has nothing to match the mighty Gears of War.
By the way if you dont believe me on the graphics point, compare the 360 and PS3 versions of FEAR - PS3 version looks washed out and poor in comparison.
Also look at the 2 versions of Call of Duty 3. Ps3 version has considerably lower res and more blurry textures compared to the Xbox 360 version.
It is PS3's price which is killing it, that and the lack of any really good quality games. It can't even rely on GTA IV to boost its sales now, because that is coming out on 360 as well, at the same time - no one who is saving up for a next gen console to play GTA IV is going to buy the more expensive PS3 to play it on.
Maybe when some of the Playstation heavywieghts start to arrive, like Metal Gear Solid and Killzone, perhaps then it will pick up. However there are no games coming out on PS3 that I have heard of which make me think "my god I need one of those"
Even stuff like Killzone - 360 has Halo 3, which will probably be just as good....