Tried the online calculator for an S5 running with 7 cent/kWh power cost... it chewed more power than it pooped BTC.
But it's still commanding 100usd apiece asking price. Any other use of that thing I dont know about??
I think they put it up there for two types of people:
1. The novice who is new to mining and does not know much about calculating electricity costs.
2. The lucky guy who lives in a third world country with cheap electricity. He just might be able to live on the satoshis he manages to scrap out of the venture... I mean after converting it into fiat.