Dreaming about cost may indicate that we feel obliged to do something. Dreaming of cost accompanied with tension, such as debts, indicates lack of freedom and restlessness.
Some people, who dread costs for debt or for punishment that we have incurred, may experience them in a dream as an obstacle.
Also, dreaming about cost can indicate a feeling of indignance or frustration concerning some part of your waking life. Anything and everything has a cost associated with it. For example, your self worth might take a hit when you encounter a rejection.