When it all boils down, you're there doing a job for money because the only way they can get somebody to do it is by paying them. It is a negative thing in your life. That's why you're getting paid to do it.
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This just isn't automatically the case.
If you have a dream job that fulfills you in every way and is nothing but a positive (I've had three such jobs), you still need to eat, pay bills, etc. So you still need to be paid for it.
How positive or negative the job is doesn't enter into whether or not people need to be paid to do the job.