Supporter Pack regional prices

Dear, GGG
I ordered a few supporter packs in the past and always thought that flags at the top of the page are only to select the language. However I occasionally learned that they also change supporter pack prices per region.
So, if you press "Kaufen" (Germany) you pay 83.20 EUR.
If you press "Buy" (international) you pay 90 USD -> around 77 EUR
If you press "Comprar" (Brasil)... it's only 38.21 EUR (which is probably not working due to payment system restrictions)

Why would even do something like that with your user base?
Do you believe that if average EU earns more money compared to average Brazilian user they have to pay more to support you?

Personally I'm not going to order any supporter packs in the future. Your policy kills any motivation.
While the prices are certainly up to GGG, it's obvious that every supporting user must get same rewards for the same price. Only diff can be the VAT per country.
(Not sure how you deal with VAT though when many users are using International just because of the language)

Off topic: IMO the Brazilian prices are about right and would generate more revenue globally as it's much easier to press purchase button. However different regional prices are simply disappointing.