7970: let's give it 180W (GPU only) -> 0,18 kWh x 24h x 31d x 0,27 EUR = 36 EUR / month ~ 46 USD / month power costs
2 x USB Miner: 5W -> 0,005 kWh x 24h x 31d x 0,27 EUR = 1 EUR / month ~ 1.28 USD / month power costs
Well, in my book there are no open questions...
I am well aware of that calculation.
Still as someone else in here already wrote: The stick definetly is overpriced because production cost can't be that high. From what I found in those forums the current per unit price for the Avalon chip in BTC is at about 0.09 in the group buys. Someone else in the forum is offering to build 10 or 20 chips into a nice miner for just about 1 BTC on top of the cost for the chips. That's essentially the same price as the Block Erupter at ten times the mining power for the 10 chip version. And I am currently looking into hopping on that boat instead of wasting my money on this thing here.