This is similar to the profit factor issue (it being set to 5) in that for very good strategies with 100% win rate, the calculations of win / loss ratio and r expectency are zero.
If using these in ranking, good strategies appear at the bottom of the list or are rejected.
Obviously they cannot be set to infinity in this case, but they should be set to a large number (e.g. 99999) not zero. Zero makes them appear the worst possible strategies when they are clearly the best in many cases.
Thanks,
Mike