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Your job as a student is to go to class and pay attention. You’re rewarded for your presence with a grade and a step closer to a degree. When you don’t go to class and let others take notes for you, or purchase them from other source, you aren’t doing your job.
So why should you get paid? You aren’t even guaranteed that the notes you get will pay off at all. Go to class; take your own notes — it’s cheaper that way.
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From http://www.purdueexponent.org/2001/02/12/opinions/index.html