At 0.9 J/GH, a full miner would come out to 720-765 Watts, correct?

Using 800 GH/s and 720W over at https://bitcoinwisdom.com/bitcoin/calculator shows me that network growth would have to average only 10% in order to turn a profit. (This is assuming it takes 20 days from today to start hashing).

I'm on the fence.