No problem. I bought a Platinum contract in January, costs: 5.2 BTC for 420Ghs, available on Feb 15.
Now do the math:
Month 01 : 1.4 BTC (at most! With a few days to go it's 1.25 actually)
Issue, is of course rising difficulty. In general that difficulty halves revenue every month. Apply that to the remainder on the year contract:
Month 02 : 0.7 BTC
Month 03 : 0.4 BTC
Month 04 : 0.2 BTC
Month 05 : 0.1 BTC
Month 06 : 0.05 BTC
Month 07 : 0.0125 BTC
Month 08 : 0.007 BTC
Month 09 : 0.004 BTC
Month 10 : 0.002 BTC
Month 11 : 0.001 BTC
Month 12 : 0.0005 BTC
Total over 12 months : 2.877 BTC
Cloudhashing charges a whopping 10% fee, makes the total 2.58 BTC.
Lets see, I invested 5.2 BTC, I will make only half that.
Actual revenue: -2.6 BTC !!!!
Update with actual earnings:
Month 01 : 1.4 BTC -> actual 1.58 : total 1.58 BTC - (10%fee) -0.16 BTC = actual payout
1.42 Month 02 : 0.7 BTC -> actual 1.22 : total 2.81 BTC - (10%fee) -0.28 BTC = actual payout
2.53 Month 03 : 0.4 BTC
Month 04 : 0.2 BTC
Month 05 : 0.1 BTC
Month 06 : 0.05 BTC
Month 07 : 0.0125 BTC
Month 08 : 0.007 BTC
Month 09 : 0.004 BTC
Month 10 : 0.002 BTC
Month 11 : 0.001 BTC
Month 12 : 0.0005 BTC
Yup, month 2 is quite a bit higher then my pre-assumption. Almost half my earnings back already, making my remarks that CloudHashing halves your investment look kinda foolish, though the end result is still not expected to go over 3BTC, still a good (or bad) 2 BTC loss! Unless I'm mistaking again of course...
But... Any cause for that big difference the past month?! Well, the difficulty increase in March was a record low. Only 11%, where a lot more was expected. And that right in the beginning of my contract, when difficulty is not so high yet that 420Ghs still matters. Second increase in March was 17%, so around expected. Result is that biggest part of March I got a better rate then expected.
Expectation is still headed towards a loss on the contract, which should be impossible considering CloudHashing's mission, as stated on their frontpage:
About
Our mission is to ensure the mining profitability of our clients for years to come while the smaller miners become less competitive and less profitable.
.