Their reply was less than informative, but it did have a few things of interest:
Thanks for writing to us at Amazon.com.
We use sales rank to show how items in our catalog are selling. The
lower the number, the higher the sales for that particular item.
Items are ranked within their product category only, so a CD ranked
at Number 1 is the best-selling CD at Amazon.com, but may not be the
overall best-selling item.
We recently launched a change to how we compute sales rank. While we
cannot provide specific information about our formula, we are pleased
to announce that we are now including Amazon Marketplace sales in the
calculation. In addition, sales ranking data will be updated
hourly. In this manner, we're working towards a system that is more
comprehensive and up to date.
We hope you find it interesting. Thanks for shopping at Amazon.com.
NOTE: No need to respond!!!
Bugsy
