At $55, it's true that the Beer Foamer is by all practical means a superfluous device that, from what we can tell, is technically a milk frother in a nicer package. But the rituals around the experience of alcohol are largely defined by the superfluous. Do we need to decant table wine in a crystal container when swishing the liquid around in our glass works just as well? Do we need specialized spoons when any old piece of tableware would stir just as effectively?