My point, OP, is that 256 is not really a lot of listings to edit. If you are continually listing new stock and letting old stock fall off, you can simply add something to your new listings.

As far as productivity goes, I would consider a few minutes work (max) to save myself losing $9 time well spent. That works out at $200 per hour if everything sells to the US. If only 10% sell to the US it's $20 an hour. If less, then it might not be that big an issue?