So 13 USD per chip for 50 GHs, way to expensive for production
For engineering it is OK
That's the price of the efficiency! The chip performance is low.
I guess they will sell the chip with respect to the nominal speed of 100 GH/s for $13. But at this operation point you will not have 0.06 J/GH.
According to their press release it should be approximately 0.12 J/GH instead.
Anyway, this would still be a good price.