Sayi "they have the money" is not an argument. It's about the amount of effort that is needed to individually buy, scan, process millions of pages. If that's done for you, why re-do it all?
Because for example if you buy a movie on disc, that's a personal license and you can watch it yourself at home. But you can't like play it at a large public venue that sell tickets to watch it. You need a different and more expensive license to make money off the usage of the content in a larger capacity like that.