I started using this rule after one big loss. It is the one that taught me to restrain my emotions and control my bankroll.
I'm starting to do the same manner mate allocating Specific amount and also having specific target of wins to decide when to stand the table.
If all gamblers has this attitude for sure this gambling section will be filled with positive comments more than negatives.
Giving advise is a positive comment, I think most of us here are responsible gambler, we just share our experience and we give advise because we want to help, so there's nothing wrong with that, and though its important that we learn from our mistakes and be a responsible gambler all the time, but we can't eliminate the reality that there are gamblers really who are weak in controlling their emotion.