Yes, I know. And we all do it. But consider this - If 80% of your trades are winners and 20% are losers, you might be tempted to put in a whole lot of time and effort and research and energy to reducing the 20%. so let’s say your efforts are very very successful and you cut the number of losers by a tenth. So now you have only 18 losers, which means you have 82 winners.
But let’s suppose your efforts at increasing the winners is equally rewarding, and you increase them by a tenth. So now you have 88 winners and therefore only 12 losers. Which is better, 82 winners or 88 winners? And remember to take account that one use of your extra time was 4 times more productive than the other.