I actually dont have to pay for any energy usage so that isnt an issue, but i understand that its a snails pace, and at those numbers more for fun and seeing how much I can output.
Free power is always good!
I'm currently mining at ~96 GH/s using a pair of BitBurner Fury cards (~150W total). Since the last difficulty increase to 511M, I mine about 0.09 bitcoin per day (about $US25 at the current exchange rate). This works out to about 26 cents per day per gigahash, which means if I was still mining with my Radeon 7950 GPU I would get around 10 cents per day (perhaps 0.0004 BTC).
Anyway, cheers and good luck!