you might be right garyriley.
Its been stated a few times that they have no expectations to go to Mac. The main reason I would suspect is because they use .net framework in virtually all of their games which causes troubles moving to Mac.
Does Valve and Paradox have mac ports? EA does, but EA is a massive behemoth of a company that can afford the extra development for a port. Stardock by comparison is very VERY small.