According to Kaz Hirai, just because Sony doesn’t “buy” exclusivity, it doesn’t mean that developers can’t make the PS3 version of their game the best one.

I think it’s important that third parties use the unique characteristics of the platform to add a little bit of extra flavour to their games. For example, with the PS3, you’ve got the Sixaxis controller, or you could utilise the extra capacity provided by Blu-ray to add more levels, put on interviews with the developers or have your videos able to play in 1080p. I think it’s really important that we talk with third party developers so that they can have these interesting extras in the PlayStation 3 version.

It would be nice to have PlayStation 3 exclusive features in games, but shouldn’t developers already know about features such as Sixaxis? I doubt developers need Sony to hold their hands while they make their games.