[kibibyte]

For what it's worth, jrpass.com is a reseller. JR nowadays has an official online site to sell the pass, which prices in JPY. https://japanrailpass.net/en/

Others have pointed out the currency conversion, which helps in keeping it affordable. But it's worth pointing out that individual train fares are also priced in JPY, and therefore are also cheaper in USD because of the same currency conversion. Compared to the huge increase in price of the pass, train fares themselves have stayed relatively stable. As a result, while the pass itself may still be affordable to those of us using USD, it's even more likely nowadays that it just makes more sense to pay for the individual train fares than for the pass.