How many copies can I expect my book to sell?

On our usage statistics page you can see the sales and downloads of all our books. As you can see, most of our publications sell fewer than 500 copies, with a number between 500 and 1,000 and a few "best-sellers" above 1,000 copies sold. It is difficult to predict which books sell well, but success both in terms of downloads and sales so far has been correlated relatively strongly with author's own outreach activities, organizing presentations, and giving lectures around their work