1) It has to be relatively expensive (to cover shipping and profit), so the candy would have to be both good and interesting to justify the cost, and my experience has been that foreign foods are very hit-and-miss.
2) I have an asian supermarket near me in Orlando, FL that carries a lot of candies and drinks.
3) The picture showed Pocky as one of the 2 products that went into that order. I can buy Pocky at Walmart (and the asian store mentioned above), so I would feel like I really wasted my money if that was in an order. And pretty much anything else I can buy at the Asian store. He has no way to know what I could buy locally, so I'd always be taking a chance that I'm paying way too much for something.
However, if the system was changed so that I can pick the candies from a selection, that might be more interesting. It's quickly approaching a standard storefront at that point, though.