Most times what employees don't understand is that whatever responsibility the are given is an oppuortunity to grow and shoul not be taken for granted,irrespective of pay,becaues pay is actually important and you cannot place an actual tag on a particular job.so for your own good and growth you approach it as a developmental step on the jobYes a staff can decide to work more than what is being paid it might be stressful but all this effort will be rewarded if not in the same company recommendation can even come from other people that have seen what he or she has done. This type of effort /hardwork prepare someone for a greater opportunity