Right, but that is a factor of your supply chain.
In Shenzhen you might make hundred boards, go down to the market and buy a hundred boxes and leave them with the shipper. Boards don't work? Re-work them or make another hundred. Box doesn't work? Buy another box. You don't like your box supplier? There is a hundred others on Taobao.
In NYC it might take you weeks to do the same thing while you are bleeding rent (and everything else) so you need the thousand boards and boxes to make it work (or you are selling very few in your spare time). And if something goes wrong you are probably fucked.
I am exaggerating, but you get the idea.