Overall, if I am correct. CoinTerra's upcoming new technology and Cex.io cloud hashing is not worth it. Simply put, you won't break even.The real question now is, "Will there actually be any profit in mining bitcoins?"
Holding onto history were the difficulty is "changing by about 'last change in % + 5%' to equal the next difficulty that changes about every 10 days or so.", by the 3rd change of difficulty in February, the difficulty factor will be 564632224929.
For demonstration purposes, I will pretend I pre-ordered the found here:
http://cointerra.com/product/terraminer-iv-2ths-networked-miner-january-batch and it arrives by the end of February.
I will assume watt usage is 1200. As stated it should be around .6W/GH/s. (
https://bitcointalk.org/index.php?topic=287049.0)
Where I live electricity is about .3510 kWh
Since 1 change is about 5% additional from last change in %, I will assume there is a 15% change, BUT the change in difficulty will be significantly be much great. The loss of money will be greater than my calculations without any doubt. Again, due to the calculators limit in functions, this number is much much lower than actual loss.
In summary: If you earn 25.00 BTC per block found with a value of $212.51 per BTC, mining with a difficulty of 564632224929.1992 at 2000000 Mh/s, power costing $0.3510 per kilowatt hour @ 1200 watts for the next 90 days, spending $5999 in startup costs:
I entered that data into:
https://bitclockers.com/calcThe results were shocking.
I would be losing about $9.73 per day.
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Overall, if I am correct. CoinTerra's upcoming new technology and Cex.io cloud hashing is not worth it. Simply put, you won't break even. Interesting numbers. I'd like to point out your difficulty number, though. 564,632,224,929 difficulty. That's 564 BILLION. For reference, the next difficulty retarget is expected to be around 500 MILLION, or < 1/1000th of your estimated difficulty for February. Currently, that 500mil diff will represent, for simplicity, around 4PH of mining power. 4000PH of mining power wouldn't quite make it to your supposed number. 4000PH, 1EH, or 4,000,000TH. At a conservative cost of $1000 per TH (way lower than any ASIC manufacturer is promising, but certainly doable for an ASIC manufacturer to deploy their own systems...) that would mean that, between now and February, people would invest over 4 Billion dollars into mining hardware. As another point of reference, most people around the forums are predicting a difficulty of ~1 to 2 Billion by early/mid January. Not 564 Billion by late Feb.