That is not a exclusive for Final Fantasy XIV almost all games are the same price policy comparing to US and EU.

Bayonetta by Platinum Games



Final Fantasy X and X-II by Square Enix



XCOM 2 and XCOM 2: War of the Chosen by 2k Games



Witcher 3: Wild Hunt by CD Projekt Red



With all these exemples why that weird price for our subscription ? Impossible for our reality... I can only say so long FFXIV, was outstanding play it until now.