How would you rate a trader based on his profit factor ?

what about a strategy that has a reward/risk ratio of around 0.3 but it only misses one in 20 times; such as rebate trading or arbitraging... the posible loss is much greater than the expected reward per trade, but you expect to get a bunch of small winners to compensate for any small lossers...
???

There´s a reason why they call it picking up pennies and dimes in front of the steam roller...
 
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