you wrote " If the loss in pips for the period is significantly greater than the spread multiplied by the number of trades made for the period, then this strategy is worth reversing; in other cases you’ll still get your margin eaten by the broker’s spread."
how much is "significantly greater" ??
lets say for a period of 14 years i get 11745 trades on eu/usd (spread 2) and profit in pips -26100 is it good enough ?
11745 x 2 is 23490, which is lower than 26100, but the difference does not seem to be worth it. It is 2610 pips over a period of 14 years and 11745 trades. You should take into account that the spread would vary during the period, there could be slippages, requotes, execution delays, etc. That would easily it up into those 2610 net profit pips.