Ego is a huge issue for human beings. Many, if not most of the ills of society can be linked back to ego. This is not different in marketing - where leveraging the customers ego can be benefitial, but allowing your own ego to cloud your judgement is almost always a problem. Despite what your ego tells you, your intuition is of limited value in strategic planning - because more often than not, it is wrong. I know your ego is telling you otherwise right now - but that simply confirms the dangers of ego.