Writers are often frustrated in how to make more sales of their books and e-books. It's all about numbers of viewers on your site. If you've made 4 sales this month and you've had only 4 people visit your site, then that's a fantastic (but unlikely) result. You'll never make more sales unless you can get more viewers.
The secret of making more sales is to have a great site with good content. Jocelyn Watkin talks about how to attract people to your website, keep them coming back for more and create your own community of interested buyers.