Many authors aspire to see their books make one or more of the bestseller lists, whether that's on the New York Times or on Amazon. The reality is that only a small percentage of authors ever make these lists due to it being a very competitive marketplace.Mark Glesne, Senior Marketing Director at HarperCollins Christian Publishing, believes there are three key things that affect a book's ability to make a bestseller list: 1) Preorder sales, which factor into your first week of sales numbers 2) Media appearances and mentions 3) Overall salesIt's important to note that each bestseller list has different factors that are taken into consideration.