How much per month miners can earn from good PC? It will be profitable for them?
Roughly numbers - $5 per day on 1 GPU. But you will have to upgrade your farm with more RAM and powerful CPU.
well, i dont think you will get many home miners then

high end pcs running the whole day would cost many in europe an arm and a leg due to teh permanent power consumption ...
maybe you will get ppl from countries where electricity is cheap.