Thanks for the warm words  
We totally understand your concern but it is very important to understand the difference between profit calculator data and real life mining data. While they should be pretty much the same, in reality it is not always the case, especially when it comes to new and volatile coins such as BTG.
If you look up the price of BTG at this very moment you will see that the price on Yobit is about $250 whereas on coinmarketcap.com its $158, and this is still only on paper and not a real market selling price
Recently, we had the opposite situation with ETH where calculators missed an opportunity to mine ETH that WinMiner users enjoyed.
Another recent example was a drop in the block size of EXP from 8 to 4 that was not updated on various calculators for a couple of days.

Our point is that when comparing, you have to compare the commitment behind the numbers - a calculator data has no commitment behind it (The calculator site will not commit to buy your hash power at the rate shown by the calculator) it is an estimated/theoretical number that could be very detached from real life data.

As BTG becomes more stable with greater volume and visibility the discrepancy between calculator estimates and real mining numbers should hopefully diminish.

Hope this clarifies.

Re Cryptonight nVidia - Are you referring to CCminer? is there other miner you have good experience with? e.g.  XMR-cast?