as always, that depends on electricity costs. 
True.Here 0.25Cent kilowatt
Ouch... Why im selling mine... Its .17 cents here, but the more you use the more they charge.. I think im upto 19 cents cause im runming 2500watts continuously... Still turning profit, but the next difficulty is gonna chamge that... Big bitcoin flaw... Who wants to mine if there is no profit.... The networknis gonna run into problems unless they start doing 50btc blocks again... As soon as roi goes negative, people will pull their machines... But i guess the true luck goes to thoose that pay 11 cents /kw
In some countries its as low as 5 cents kwh they are still ok.