Fee is 2% for the pool, but prices fluctuate on the exchanges and it takes time to mature the coins so the price you mine at might be different than the price it sells at. Crackfoo has said that he pays the fees to payout coins.
Exchange? MAC to MAC?
I have no idea what you are asking. Try using complete sentences instead of one word responses.
Just math
Last 50 Earnings: MPi4P5wBUjF6LK5WNVQp8VbxQL3XZcxMdQ
Machine (timetravel) 1.561100 MAC
Machine (timetravel) 1.931584 MAC
Total: 3.492684
Look at my wallet
Wallet: MPi4P5wBUjF6LK5WNVQp8VbxQL3XZcxMdQ
Total Earned: 2.52570141 MAC
Where are the other coins?