But what to you think the max $/GH/s to break even within 12 months will be? What factors do you assume? What are your assumptions based on?
P.s. Just leave electricity costs out of the equation.
My baseless speculation is 40-50 GHS.
Or look into cex.io
Well, at cex.io the price is almost 37$/Gh and going up for the last few days - guess supply and demand also works for mining power
Personally I calculate my estimated hashrate with 30% difficulty increases. Some people say it will flatten out at some point but its really impossible to know. Electricity costs are substantial, I dont know why you would leave them out.
I leave electricity out because if I don't find an insanely cheap solar powered place to power my miner, I doubt I'll have it running for more than a few weeks. There's a limit on how much extra I'm willing to pay for my "mining fun"