he also have 1200 gpu i find it absurd that he can't afford a single 1080ti.....
Really? Doubt it. 1200 * 3$ day * 30day = 108000$ month.
Making this farm faster 10-20-30% by internal use miners will give him much more profit then X0.05BTC "donations".
I don't have 1200gpu's. But I have many gpu's running private binaries not for public distribution.. My 0.05 btc kernels are spread and sold for pocketmoney. Ppl don't understand that every miner share the same pot of coins.. If you spread the miner to your friend, and he spread it to his friend.. etc. The advantage is gone.