The use of 20% for the difficulty increase should be questioned.
It is much more likely the difficulty increase this year will be 15% falling to 10%.
I suggest you redo the calculations assuming 15%. In this case mining is attractive and the miner is profitable to run well into 2015.
So what it comes down to is do you believe the difficulty increase this year will average 20% or is 10-15% more likely. Remember the last difficulty increase was 11.39%.
It is much more likely the difficulty increase this year will be 15% falling to 10%.
I suggest you redo the calculations assuming 15%. In this case mining is attractive and the miner is profitable to run well into 2015.
So what it comes down to is do you believe the difficulty increase this year will average 20% or is 10-15% more likely. Remember the last difficulty increase was 11.39%.
Ok, put the diff increase at 15%..
By calculations, machine of 1Th/s arrived at 29.03. at price 5900$(with shipping+customs+taxes included) will pay of exactly at new years eve
And assuming price of 636$ per BTC..
now imagine if btc goes to $800. the electrical cost becomes much less significant
now imagine if we see more difficulty jumps like the last one at 11.2%? I don't think we will see a jump greater than 20% ever again IMO
