Kantor on 10 February 2009
Because the majority of people trolling these games are people who have never played them and often don't own the console they are on. The PSN ID is just a way to prove you own the console.
Oh, and how can you own a PS3 and say all PS3 games have installations? Killzone 2 doesn't have an install!
(Former) Lead Moderator and (Eternal) VGC Detective 
