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"Or maybe they just don't care about their students, or access to more customers and revenue."

Or may be they realize that students may not be the best customers in terms of access to money. I mean, isn't it one of the great cliches that your average college student is getting by on ramen packets? What the e-tailers want is access to the workforce: those who already have jobs. That's where all the accessible money is to be found.