KDP Select free promotion results

From Jan. 9 to Jan 11, Numbers Plus Four was free on Amazon as part of the KDP Select program. Before going free, the book averaged just one sale per month and was ranked around #500,000 in the Kindle Store. On the first day that it was free, about 100 people downloaded it. The book reached #1,800 on the "Free in Kindle Store" list and as high as #47 within the Short Stories category! (See screen shot below)

Interest faded quickly on the second and third days of the promotion. By the second da...