with production setup costs minimal in china a $17 per gh/s rate is possible and real. Only $17 for 1 GH/S.
KNC is $17.50
I would rather support them instead. China is trying to dominate. Every dollar given to China for btc hardware lets them reinvest in themselves many times. KNC & BFL are only using testnet. China isn't. Which screws you in the end.