3GH/s doesn't cover your costs?  

I am running barely 1GH/s, and it STILL more than pays for all the electricity my house uses in total.

Are you on a Pay As You Go 3G WiFi dongle, and powered by a petrol powered generator?

Jokes aside, I don't see how 3GH/s can't pay for its self - especially as the future potential value of BTC could be very high.

My one machine, making roughly 1GH/s costs me about 7 pence per hour to run, or £1.68 per day - and my payments of 0.05BTC come, on average, 33 hours apart, so I am generating £3.11 per day, or £1.43 profit after electricity costs