Because we've had this discussion before with other third party games.
Face the facts- the game publishers are in it to make money and these days they cannot do that by being exclusive to one console. Star Ocean, Final Fantasy, etc. were never Sony's properties, they are SquareEnix's. They are just doing what they can to maximize potential profit in today's gaming climate. You still get to play it so there is no need for the fanboy 'tude there. Don't hate the system, hate the game.