I think I was trying to get across the idea that what consitutes "proper BRM" for one player with one style of play and one degree of emotional tolerance and confidence in his game could and probably is entirely unsuitable for another.
A FR multitabling nit making a small but steady profit playing a low variance style is going to need a completely different BRM plan to a higher stakes LAG playing 4 tables riding the 6-max rollercoaster. You also need to take in to account there experience and ability to rationalise variance.
If they both blindly follow this 5% rule the FR guy will probably be wasting time when he could be playing higher and the LAG's stress levels could become a major health concern!
About 2000
hands ago I found myself playing 10NL 6-max with an approx $150 BR and a horrific string of beats. It was testing but I felt I had been playing pretty well considering and trusted that the numbers would even out in the end. Of course the decision to stick with it payed off on this occasion, plus I was reasured by the knowledge that even had I gone broke, 10NL is where I should be and reloading wouldn't have been beyond my means.