I have a combination scanner/printer/photocopier that connects to the PC. However, the last time I tried to scan a book, it took 30 seconds per page. With the camera-based scanner, it is taking me 3 seconds per page.
But even if I had a high-speed Xerox photocopier with a PC connection, I would still have to turn the page, turn the book over, smash the book flat against the glass, press the button, turn the book over again, turn the page, and so on. I would get very tired!