I would hope MPH makes a small profit....servers need to get paid, owners need to eat.
The pool fee ?? The owners are probably millionaires for a long time now.
I lost quite big money at previous eth overpaid issue. You would be surprised with the amount.
Also there was etc fork issue too which made me to pay from my pocket.
I had to run pool in loss 1 year before. Pool didn't make $300 a month at that time and the server bill was higher than that.
Can you imagine the hungry situation at that time?
I can say that I'm not running in loss overall now but it's far from millionaire.
Miningpoolhub is not that big pool actually. It's still small, need to grow much.