Not only toooooo much time on their hands, but plenty of disposable cash. Cause that's what they are doing, disposing of cash on stupidity.
any silly thing, the more harmless the more likely, that becomes popular, someone will always come up with this. so much so i don't doubt this was intended as a joke. and then, just wait, if it hasn't happened yet, every joke of exaggerated popularity, someone, sometimes whole movements spring up, to take it seriously. barbies, rubic's cubes, hula hoops, now we got spinners. and don't even, fantasy role playing gamers.
I now am convinced, those damn things are from the Devil. My wife can't stop buying them for the Grand Kids. They can't stop LOSING them!