Yep, and then Sony decided to steal Nintendo's idea of motion sensitivity. Pretty funny actually... They were so desparate that they removed the rumble feature in order to fit in the motion sensors. And the great thing is that it's not even half as good as Nintendos, as well as the controllers do not know "where" they are, while the Wii's remotes do - the Wii can tell where each individual remote is relevant to other controllers and to the system itself.
Anyway... $500-$600 is pushing it... way too much