paul said:
Could it be that a lot of PG's books are rarely read, and the traffic seen for these books is due to people downloading the whole collection simply to have it?
could be. but i doubt there are many such people. and is there any particular reason why you'd want to doubt that there is actually an audience for a book? if the only people who download unpopular books are the ones who are downloading all books, then you should have a number of unpopular books that have the exact same download-count all the time... so if you need to test your hypothesis, that's a way. p.g. books are different from google books, in that someone has spent a good deal of time on each one, meaning that there has to be some intrinsic interest. -bowerbird