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Quote from: Gator-hex on October 20, 2013, 01:21:54 AM

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what is the ROI period?

Use http://www.bitcoinx.com/profit/ to calculate it as it assumes a profit decline into the equation. Roll Eyes

I got 63 days based on 6BTC @ $170ea 0.15c/kWh power but prices move every day who knows tomorrow or how long it takes to deliver?

I checked too, that's good!

Would you recommend?

That calculator assumes decrease of profitability over A YEAR and the default is set to 60%. Difficulty has been increasing 40% every 10 days or so.

...so it's not accurate?

If we assume ~35 10day periods in a year and compound 40% increases each period that gives roughly a 13,000,000% increase over that year. Does 13M% increase in difficulty sound like more than 60% drop in profitability?

Of course we very likely won't see 40% increases each period over the next 12 months, however the take away should be that yes profitability will almost certainly drop far more than 60% in a year.

Please correct me if my 13m figure is off, it's been awhile since I've done much math.

By my calculations At $170/btc and $0.15 / kWh its going to cost more to mine than what you return after around 70 days at 40% increases, so you dont even have to look at it a full year.

Even at the rate as of this posting which is $195 / btc that would only buy you a few more days at 40% increases.

Its almost like the inital calcs were made (intentionally incorrectly) by hardware makers to help push sales.

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