While a mining profitability calculator would be nice, I see very little value in having a calculator go from RAC --> GRC/day. The difficulty is reaching a good estimate for RAC in the first place.

The other big problem with basing the calculator off the hardware of other miners is that:

• Many top miners keep their hardware (hosts) hidden
• We have no idea how much time the hardware is live. It could be running only half the time.

I am 100% for a mining calculator, but I have not found a reliable way to estimate GRC mining profits on the fly.