Earned trade fees are their earnings from all trades, not just yours. You don't have to trade, just hold 1BTC or more in your account.
Did anyone receive interest? How much am I gonna get from 1BTC?
oh ok, i got it now. thats interesting, but i dont have any idea how much they earn on trade fees per day.
They total up the profit they made from trade fees, take off 15% and divide it between account holders based on the size of their wallets.
So it depends on the volume of the day, your account balance, and every other account's balance as well.