They did it so they could "re-release" it in the future and charge you AGAIN...
Do you know that games from the 80's that never even had "multiplayer" (it didn't exist) have operational multiplayer modes on PS3 that nobody even plays! WHY?!? B/C they want to have you buy the Syphon Filter games again down the road because "it has multiplayer."
Shame on you Sony.