Don't know if their 62% difficulty increase is realistic... maybe worst case scenario?
It's the change over the last 30 days. I don't know how any other number could be considered more realistic than what has happened in the last month.
Agree - looks really nasty if, like me, you ordered a Mercury you won't receive until October at best. But this is probably the most realistic calculator compared to say coinish which paints a rosey picture. Really dependent on btc...push price to $150 and thinks look much more palatable. At any rate, I hope to use this whole experience as evaluation to determine if I continue the mining journey with KnC in March w/ their 2nd gen stuff..