5.3% on what? Not on margin or the value of the contract, the cost just represented 5.3% of his profits per trade not that he has to make 5% on the account to break even.
Yes, but then you are assuming that his average profit per trade will be the same in the long run.
In any case and in general, if the commissions/spread/slippage represent 5% of your gross profit, you need to make at least 5% just to break even, on each trade.
And like I said before, the overwhelming majority of hedge funds cannot even make 2% a month on average.


