I love the way the sales ranking drops when no-one is buying.
Statistical range (observed) between 7,406 and 330,000+
The lowest ranking I have found is around 1.5 million, but that's for a book that Amazon no longer sells. These stay on the system for third-party sellers, so the ranking slips lower every time a new title is introduced and registers its first Amazon sale. This seems irreversible. Rather sad, like watching a sweet little space probe slip out of the solar system for ever.
"Mummy, why is Daddy crying?"
"I don't think Radio Two acknowledged his press release yet, Dear."