The point is that if a book that had been published three years ago started to sell twice as many all of a sudden it probably wouldn't even get noticed. People wouldn't be tracking it. The system has cleaned up its act an awful lot but the best-seller list system is not an entirely foolproof thing.
Terry PratchettI stroll along, talk, I sign books, people buy me drinks, I forget where my hotel is, I get lost and fall into some local body of water... done it hundreds of times.
Terry Pratchett