MikeB said:
Game preferences is another topic. Not everyone buys all the games out there for a platform, people may well be satisfied with a just a handful of games per year like for example Singstar, MGS4, GTA IV, Uncharted, etc and may well reason quality above quantity.
It seems to be the case based on VGChartz data.
After 1 year and 3 months on the market the PS3 attach rate in "Others" is about 3.28 games.
After 2 years and 8 months (or more) on the market the 360 attach rate in "Others" is about 2.94.
So it seems people on average buy about 4-5 games on average per year for the PS3. New users will of course on average have a smaller games library than those who owned their console for a longer period of time.
What I am saying it's often more interesting to people to have a few games they truly love, than having many titles available that are OK but appeal less to them. If you want Halo 3 the 360 is the console to get, if you want MGS4 the only choice is to get a PS3.