Actually, it can hurt. In that
-Apple will be forced to waste money on these lawsuits
-Even if Psystar wins, it just means that either (a) OS X costs more or (b) OS X isn't sold retail period
-If Apple is somehow forced to officially allow OS X on other platforms, they still couldn't be forced to write drivers for 3rd party hardware themselves, they just couldn't prevent others from doing it. That means OS X becomes less stable the more configurations it's sold on, which means increased support costs for Apple, which means higher prices all around.
I'm not stating Apple should release OS X for other machines as Microsoft. I am stating that perhaps selling a "Mac Pro" desktop system that is cheaper may (unlikely) force Apple's hand into producing an actual desktop processor system. As for cost, Apple literally has billions of dollars burning a hole in its pocket, I doubt this lawsuit will hurt them financially.