in my opinion the self esteem and a great income are the two most important reasons for seeking promotions at work.
first of all, a person seeking a promotion has to be as confident as possible on his or herself, because the most one's promoted, the most the responsabilities at work increase, so confidence and determination are the strenght for succees.
for example while being in a situation to take an important decision for an important matter, the reponsable person has to be confident and sure before ending up with a final choice.
second, I also do believe that a self esteem is reached while getting a great income, as being wealthy so appreciate an oppulent life, having responsabilities which sometimes get on one' s favour , getting a wide carreer, are reasons to nurturn a person.
personnaly I aim to get a well paid job, be able to get off work for some hollidays and spend my saved money on travelling.
I m not seeking promotions neither hard reponsabilities.