Gamebattles Ladder

Does anyone know why gamebattles had a ladder for borderlands under xbox 360, but not one for the ps3? This is really bothering me considering I've been looking foward to a PvP system since I got the game. I mean there really isnt much to do once you've reached level 50 except to wait for the latest DLC to come out and beat that in a day. If anyone has any insight please let me know.