There is another factor, that some games are coming. Ninja Gaiden Sigma just came out, as well as other games such as Rainbow Six: Vegas. Fast forward to August and you have Lair, Stranglehold (the PS3's special edition of the game has the movie, Hard Boiled on the disk), Warhawk, and GRAW2 to name a couple (Taken from IGN's release date listing). September looks to have Heavenly Sword and October looks like Ratchet and Clank, Home, The Orange Box (HL2: Episode 2), and some others (that list has GTAIV in October as well, but I haven't followed it that much so I can't really say).