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I now have a solid theory about these rankings, based on the performance of my own book and others that I have purchased. At the level I have described above, there are no sales currently taking place, but there was a recent sale which places the book in the 2000-2500 level. It looks like I recently sold a book, because I then jumped to the 1500-1800 level. In other words, there appear to be ranges or bands which indicate sales.
The curious thing is why do books bounce around these bands over the course of a day? I've looked at this carefully, not only with my book but with the relation of my book with others in the same band. Oddly enough, I can be ahead of one book only to fall behind that same book later in the day, and then flip ahead again the next day. I have no explanation for this, other than to chalk it up to a random distribution of a book that has equal sales with other books in the same band.
Incidentally, Sony confirmed that the charts are based on a week's worth of sales.
So there you go! It's a bummer that my book, Pieces of the Empire, has not sold better given all the work I've done to promote it, but there is at least some satisfaction in having understood what the Sony rankings mean. It was like solving a Sudoku puzzle.
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