It is a concern with BTC so low ~$485 now. $.08 would be ~.000165 BTC. The projected earnings are .00064393 BTC, leaving about .00047893 BTC. The current cost of 1 MHS is about .03299 BTC so the daily yield is a ~ 1.45%.
However, I don't see how such high rewards can be maintained and it is possible the BTC could drop much lower. So there is a *LOT* of risk here.
It's also possible that BTC goes up much higher. Do I have to remind you that the last high value of BTC was over $1000?
With the prices below $500 all of us who bought miners in the last 6 months won't ROI, but I'm certain we won't stay at this price.
Sure ... but right now the risk is to the downside.