It seems that even though the 60GB version was shipped 5:1 to the 20GB, it sold 10:1. So Sony doesn't see much point in selling it.
Say what one will about the Core 360, you could still get anything you wanted seperately. The 20GB coulnd't do that.
Now don't think this is bashing the PS3. Sony made this decision. I'm just pointing it out and, why I think they did.
A flashy-first game is awesome when it comes out. A great-first game is awesome forever.
Plus, just for the hell of it: Kelly Brook at the 2008 BAFTAs