Lol, looking at these pies and knowing other things about Japan, I understand that this is a country where such a thing as "cost price" does not really matter.
I doubt that I would allow myself three pies for twenty bucks, the cost of which is about one dollar, but I understand the price of a forgotten taste when you want to remember the taste of childhood, the taste of your homeland. In our area, such pies are called chebureks. They are not cheap, especially on Odessa beaches, where vendors carry them in thermos bags and sell for one dollar each.
But, they are from the usual, wheat dough. It’s hard for me to imagine the taste of coconut dough, probably, it would be very expensive here. As for the corn dough, it goes well with sheep's cheese. Yes, it's a pity that I'm not in Japan, I see that there are a lot of incentives for a successful business, lol.