[abc_lisper]

Because, you undervalue your time, you open yourself for abuse. May be that project that is behind can be done by you after work, as you sometimes do work then anyways. I have seen some managers who are acutely sensitive to this and repeatedly use this to their advantage while charming the underlings. Next, being on call means it is difficult to plan that long vacation, or a unplanned night of shit faced drinking with your buddies, or unable to sit with your kid in the night when she is sick. A perspective of life as unpredictable events helps reinforce this idea. You are, with out compensation making life predictable for others while making it less predictable to you. Third, your mental and physical health. Sleep disorders because of restlessness, groggy mornings and the stress that comes with normal working hours will take a toll over long term.