Hidden fee? Do you have some numbers/statistics to shed some light on your claims?
I concur with him. There is some strange thing with mining income. For example, I have 2100 h/s with equihash. And crypto-coinz.net predicts 1700 coins per 24 hrs. On suprnova I get only 1500. On miningspeed 1200. And so on. Always less then prediction, never more. (There was luckpool which actually could give a little more (with luck factor) but it was quite buggy so I abandoned it)
Its so simple and yet noone understand Most calculators take diff in the moment of calculation, so for fast diff retarget coins you have large miss (up or down) if you dont input the diff manualy. So..