they hurt the people trying to buy the tickets by depriving them of a fair and reasonable price.
But what is "fair and reasonable"? It often goes the other way. For games against teams like EMU, U-M often has a few thousand extra $70 tickets for sale that are hard to move. They're hard to sell because you can easily obtain a ticket for below face-value (sometimes far below it) from a scalper. Without the scalper you'd be forced to pay the $70.