We currently have 9 rigs producing ~8.1 Ghash/sec.
Those costs are high estimates, the output is just about right.
These numbers alone should tell any potential investor that theres some loss in the system. Usual triple 5850 roi + mh/w champions are at over 1gh/s hence there should be easily between 9.4 and 10gh from 9 machines. Its a very bad investment.