You shouldn't leave a job if your boss needs you.
Carol has been working as an executive assistant for her current employer for five years, and he is very dependent upon her.
Carol wants to make a higher salary.
Carol speaks directly with her boss about some financial issues she's been having.
Carol quits suddenly with no prior notice.
Carol's boss gives her a raise and some extra vacation days.
Carol is unable to find higher paying work and winds up making less money at a job she doesn't enjoy.