Exactly my point in another thread
New price for AntMiner S1: 0.468 btc each one, shipping cost included.
Thanks for the price adjustment. However that still works out to about 60 days ROI, if not longer, 4 shifts in difficulty between now and then to somewhere around 12 billion mark, and by that time this 180 GH/s miner will be making just enough to pay for its power costs...
0.4 would be a fairer price as it would allow a miner to make 0.068 BTC before turning the miner off - just enough to pay for the PSU.