Well for one I do own a PS3 and a 360. And I do know what you must be going through but I think you really need to grow up. You want more games from Square right? Then you should understand the financial aspect of creating these titles. Square need the money so making their games multiplatform is going to give them a lot more of it, which they can use to make even more games. And they will always support the PS3 unless the 360 makes a huge turn around in Japan, which its safe to say it won't.

The issues I have with FFXIII going to 360 differ from yours, for one it delays a game which seemed like it was never going to come out in our lifetime anyway and it makes the two consoles even more similar. I would of liked FFXIII to be one of the key games for the PS3 and the same with Bioshock to the 360. But alas, I can't have it my way and now I feel very depressed as a multi-console owner.

Bottom line though is that you should support the games, not the console.