That's great for you to support the Behemoth and Castle Crashers in that way, but I don't think anyone here has been stating that the PS3 can't have exclusive characters so what's there to be angered about?
Only thing I've really seen is wanting equal support for both platforms. In this way the Behemoth can say "Thanks for your patience PS3 owners, here's a little extra to make the game new again" while at the same time saying "Thanks for your continued support Xbox fans, we're now able to bring in even more fans now (even if on other platforms), so here's a little something new found on the new release of Castle Crashers."
Don't fault fans for wanting to get to play more of what they love. And if you only own a PS3 be sure to support the Behemoth through Castle Crashers; with enough support maybe Alien Hominid could be released!