Some people collect different numbers for different reasons, 7, 8 or 13 for luck, I've heard of people collecting #12, or all the #14, 15 and 16, etc so it would be worth more to the particular people collecting these numbers.
#001 will always be worth more in my opinion because it's just plain cool to have #001. Personally I'd rather have a #001 serial than a marked prototype if the prototype doesn't offer anything special over a regular production, and if there are a few dozen prototypes.