Other companies like Blizzard charging US players 12,99$ and European players 12.99 euros?

Currencies fluctuates all the time. Im pretty happy being from Norway since NOK is very strong against Euro and USD. If they charged in NoKs, it would probably be 199Nok pr month and not 72 as it is now from paying 9.99euro, or 12.99 since i pay for 2 characters total.

If I buy something from US, i pay in USD, I order from UK its £, Japan its Yen.