Ответили.
"I suppose currency of the sales calculated as 0.25 USD is KRW.
Subscription sales with KRW are all included in Sales from Storefront
Partner Sites.
Photokore gained 50% of its profit but because of that, the royalty to
contributors were rather row so we decided to fix the price of it as
0.25 USD(we already sent e-mails to contributors so please check your
previous e-mail). We're on a plan of increasing storefront sales royalty and it will be
treated as same as normal sales."
Они так мало получают в своих корейских деньгах, что не могут пока платить больше чем 0.25 американских центов за подписку.