Not to derail this too much, but I think I've come across the worst offender I've seen as far as "buy our game new, and day one!" incentives. Battlefield: Bad Company 2. Of course, you get a silenced AK-47 (for use in multiplayer) if you preorder at gamestop. But then they've got a limited edition. It's the same price as the normal edition, but only available near launch. It gives you mounted guns for control from the driver seat of any vehicle, increased armor for any vehicle you drive, motion sensor for your vehicles to tell you if enemies are nearby, and a tracking dart gun that allows friendly rockets to lock onto a vehicle, even out of line of sight. All of this is exclusive to the limited edition, and usable in multiplayer.
But the AvP collector's edition? Life sized articulated face hugger. me want.