I've been reporting all sorts of sales numbers for my books. I thought I'd report on my sales rank. Here's the Amazon Best Seller Rank tracking for Dead Dwarves Don't Dance since December (I published the novel in late November).
As you can see, it's slowly working it's way down the rankings. It's been as low as #6,047, which happened today. This month, it's been ranging from 11,000 to 6,000, with some spikage up to #23,789.
Since Amazon does not publicize their rank algorhythm, we can only speculate on what all the fluctuations actually mean. Obviously, sales numbers must be the major part of it. But, is it hourly/daily/weekly sales? How much weight does each have in the ranking system?
I've been selling at least 8 copies of Dead Dwarves Don't Dance per day since last Thursday. So, it looks like 8 copies a day can get your book into the top 10,000 in rankings. Can anyone else corroborate this?