Nothing to stop people pointing their USB miners at PPC and other SHA256 coins. Just saying.
Truth, but if that was more profitable now then wouldn't people be doing that?
If not, then when it becomes more profitable than Bitcoin, will it still be worth the electricity? I mean free money is free money, but if you are making 20 cents a day off of a dozen block erupters then I think even for free electricity I would just make them into keychains and try to sell them for a few bucks
They only use 2.5 watts. A Raspberry PI uses 3.5 watts. Power usage is negligible.