Amazon could easily improve their rankings by changing it from "most purchased" to "pages read" or a similar metric. "Time users spent reading per dollar cost"

Amazon could easily improve their rankings by changing it from "most purchased" to "pages read" or a similar metric. "Time users spent reading per dollar cost" would be a good measure. You could add something in to get a novelty factor if you wanted. This would solve the pre-order problem as books wouldn't rank until people started reading them. It would also weed out books that people buy but don't actually read.