Indeed. I liked the line about 'production bumped it up to x print run to save money in case it was a best-seller'. But how many books are best-sellers? If you instead reduced every print run on principle, you would indeed be caught out by the rare best-seller, but so what. The reprint would be slightly more expensive than having some extra copies from the first printing, but you would have saved from all the other printings that didn't turn out to be bestsellers.
Re: breaking down some line items