Plus our hash rates are just as competitive as anyone else, if not better.
I am afraid that the hashrate on PBmining is much cheaper than yours, though some believe it is just a ponzi scam...
It's cheaper but you are locked into a 5 year contract, in that time miners will be very different machines. Plus the price they charge for a 5 year operation on 2TH/s set up would not even cover cost of electricity.
Based on the current cost of power in Saskatchewan Canada (where they state they are based from) a highly efficient unit like the Antminer S2 runs at about 1,100 watts *2 to get up to the 2TH/s and this would work out to $10,560 in power costs over five years. You can look up this using the Saskatchewan power authorities pricing model:
http://www.saskpower.com/calculator/residentialWe're competitive with or better than any main stream and reliable service. From a name users known and trust.