So why isn't this more popular: 10 friends buy the book and split the cost. Scan it and put it on their ipads. Go to class using the ipad version. (ipad is fas

So why isn't this more popular: 10 friends buy the book and split the cost. Scan it and put it on their ipads. Go to class using the ipad version. (ipad is fast, even high-dpi scans work very well) ?