who said pbmining had no electricity costs 
that explains the difference in payments, otherwise would exist SKIMMING PAYOUTS.
that explains the difference in payments, otherwise would exist SKIMMING PAYOUTS.Can you find any mention of electricity costs?
I'm not sure why anyone in their right mind would buy a contract that allows the operator to pay out whatever he wants.
There is no mention about fees but PBmining is asking some BTC when Ghs are being bought. I can't say actual fee/Ghs as I haven't done any math.
What is math? 
Your sig proves it...
~~MZ~~