I think even teachers serve their egos. On the topic at hand, they're usually, "the smartest guys in the room". That has to help bolster one's self esteem. As far as religious figures go, they compete on piety. The most pious, (and politically savvy), gets to be pope. Which again, has to be good for the ego, as well as the "soul". They're basically the best salesman on the planet, with their product of, "an unprovable truth, against an unprovable punishment". Fill up the plate as it goes by, sil vous plait...However, the wise man can see that doing things that better the society will benefit him as well. Sometimes you bring yourself up by bringing those around you up.
(I'm not completely sure, but we may be a bit off topic,....LOL).
Oh BTW, good point!