last they responded me saying nmcwas converted to btc and added to balance..
i havent kept track so IDK but the nmc is trivial and im not concerned.
its typical bitmain behavior.
they've never failed to pay what they owe,
but their system of keeping the tx fees is a lousy holdover from the days when tx fees didn't amount to much.
recently tx fees have been running over 6btc per block! so i would suggest mining where they pay them out.