Wouldn't it be hard for Amazon to claim that you owe them more than $80 given that they sell Prime for that price? And, Amazon probably won't ask everyone (or

Wouldn't it be hard for Amazon to claim that you owe them more than $80 given that they sell Prime for that price? And, Amazon probably won't ask everyone (or even many students) for proof given that most would probably forget -- an outcome which hurts Amazon's goal of capturing student revenue.