Even if it was 50%, noticing and then re-evaluating your emotional 'advisor' won't have the same result as ignoring it. For example, if 50% of your bad moods are because of random brain-chemistry imbalances, and 50% indicate a problem, you can either ignore all bad moods, or notice all bad moods and then go look for problems that might be causing them. In which case you'll find a potentially fixable problem 50% of the time, and no apparent cause the other 50%. So at the cost of more energy spent on thought and emotion-evaluation, you can catch some problems in your life that you might not have noticed otherwise. This would still be true even if only 25% of bad moods were in response to a fixable problem: there would be a higher cost of emotion-evaluation relative to payoff in problem-discovery, but the result would still be different than if you just ignored the bad moods.