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What is a fair Fee?

Hello, I wanna ask u guys what do u think about this kind of Fee? When i made the last month a profit.... .....more than 20% the fee is going up by 10$ .... From 10% to 20% by 5$ .... From 5% to 10% nothing happens .... from 0 to 5 % the fee is going down by 5$ .... For a negative month the fee is