Yeah those are some pretty goofball peripherals. I own all three major consoles and I have not bought funny peripherals for any of them, apart from quiz controllers (which are actually pretty fun when you have people over) and a DVD remote control. I don't really like the idea of buying a plastic shell that resembles another item, just to make the experience better (because it doesn't).
I have got a friend who recently bought a gun accessory for his PS Move and he is quite unhappy with it. He reckons that sitting on the couch with your controller is still "the only way to roll".