Hello blarman,
Well, it is their money. I am reminded of the saying, "a fool and his money..."
Also the copper and magnetic bracelets people buy... http://www.thenakedscientists.com/HTML/q...
I suppose the placebo effect could have some benefit.
Regards,
O.A.

But they make for great conversation at parties. For anyone who thinks they are actually accurate I have some Florida land I wish to sell to them. Its a fad, sort of like the "pet rock" craze. Perhaps, in time, they might become more accurate. In the meantime let people spend money as they see fit. I enjoy wearing my Fitbit Force and have not yet been electrocuted by the device.