Re: I hear often that mining is not worth it anymore for newcomers, is this true?
Thank you for the reply. Unfortunately I have to pay 15 cents for power, that means its not worth it? 
I planned to buy 2 cards hd 6970 and this calculator (http://98.200.247.249:81/btc_calc.php) shows that I might be able to still make some profit, even get the return of my investment in 100 days.
I planned to buy 2 cards hd 6970 and this calculator (http://98.200.247.249:81/btc_calc.php) shows that I might be able to still make some profit, even get the return of my investment in 100 days.
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The current difficulty
The estimated difficulty change
And since there's a difficulty change every ~12 days, it will be a lot longer then 100 days. That calculator only uses the current difficulty and the estimated difficulty and uses it in the calculations like it will be the same estimate every time. Currently it's around 15% increase, but we've had enough 50-60% increases before.The estimated difficulty change