Spondoolies Tech seems to indicate that PBmining it's a ponzi:
This is not endorsement to buy CBCM, but I look at PBMINING cost. The electricity alone for 5 years cost a lot more than the contract cost per $/GHs
Either it is a pyramid or they expect to replace with new hardware at an unrealistic rate. Do the math.
Guy
quoted from
https://bitcointalk.org/index.php?topic=647360.0.
i am not for or against spooning but i hear this thing about electricity all the time- it is so dumb- if electric costs more than the mining you just pay out the mining - will there be more btc machines within the next 5 years - you bet, but it is not necessary for pb to even invest in them... just run the numbers , year5 wont add up to 1 btc for every single customer, pb just hast to match apples to apples, also you dont even need to make back all your btc for a profit.... if the value of btc goes up you can be read in btc but black in cash