Ultimately it will be the sellers getting their butts kicked if something arrives broken. I would be extremely pished off if one of my items was repacked after I'd already done it adequately. I post fragile items and know how to pack them. I've never had a breakage. How would I know that PB are going to repack to my standard? I suspect the only way I would know is when buyers start complaining that their items arrive broken. Too late then!