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@LegoSonicBoy Interesting, I don't think they are LEGO Certified Stores as I mentioned above that they only use the "official store" for an online shop, not their own brand stores both online/offline.
FYI, I've been adding some custom items to sell on BO and found some issues with it although those are seller's issue: inventory management is hard and far less intuitive than website interface, help document is incomplete, and support is poor.
So it's about 30% on production/manufacturing cost, more than I've thought. I've also heard that paper box often costs 10% of set price, and ABS plastic is cheap so it's surprisingly that box might cost more than bricks inside it :). Thank you.