KitKat globally is run by Nestle.
That's one reason why.
The second is that in Japan Kit Kat sounds like "good luck" which is why they became popular, and two, why we see such regional variation.
(I have 4 Japanese flavors in my NYC fridge right now -- Sweet Potato, Adult Sweetness, Wheat, and Caramel Pudding (which you bake!)
Another perk I've found about treats from overseas is they use actual sugar instead of high fructose corn syrup.
>"Ingredients: Chocolate (Sugar, Lactose, Vegetable Oil(palm)whole milk powder, cocoa butter), wheat flour, vegetable oil, lactose, sugar, caramel powder (skim milk, concentrated milk), yeast extract, cocoa powder, whole milk powder, cocoa mass, cocoa butter, emulsifier(lethal, sucrose fatty acid ester, glycerin fatty acid ester), sodium bicarbonate, flavor, yeast extract,(contains wheat, milk, soybeans)"
https://community.gaijin.net/issues/p/warthunder/i/WpsnCaNDw...
Oh my god I have some of these I should have looked at the back of the package more closely!
Kitto katsu! means "you will surely win" or "you will surely succeed".
So it is given as tokens for success in exams and the like.
Katsu for winning/succeeding also can be seen in Tonkatsu = pork cutlet (katsu is the Japanese "shortening" of cutlet), which is also offered as a success token.
I'm sorry, what?
It's likely a profit boner. Margins on obscure flavors aren't projected to be high enough in whatever market, so they don't offer it. But in some other market, projections look good, so they offer it.
Much simpler to have a few flavors shipped to millions of stores daily.
The normal ones are fine, but they're not magic
Though I like to think the Nestlé/Hershey executives have been threatened by immaculately-suited Pocky-toting enforcers of the importers making profits on the novelty arbitrage.
KitKat around the world is Nestle. KitKat in the US is under license to Hershey. Licensing is expensive.
Perhaps you can make wafer bubbly, so it's more air? Although it's cheaper to just put it in a plastic wrapper and fill the wrapper with nitrogen...
KitKat has a lot of competition in the UK where caramels are way more popular than weird KK flavors.
Last time I was there I spent about £100 on sweets that had tiny little train cars in them and the chocolate was terrible and I ate all of it.