Well it looks like we're on track to have a massive bump in difficulty this coming adjustment. If those early BFL/Avalon units haven't shut off yet this will probably be the death knell (for any home users anyway).
Sure enough. Will be shutting my square beauties down next jump. Electric only 0.07/kw hour too :/
Oh well, maybe I'll get to turn them back on someday when bitcoin spikes again (yeah baby)