So, make the wealthier countries pay more to indirectly let other countries for the price of a pizza? No, thanks. If you can not afford the price, do not buy. Do not ask other people to pay more so you can get it for a dime.
Plus: If some people think they do not want to pay $60 for a game that others have to pay only $20 for, they could pirate it - and the guys behind it get nothing. Or they pay $30 for it and the studio makes at least some money - based on what people here wrote the publisher is happy to make at least some money from the "poor" countries (Russia and China are poor? When did that happen?!), so they can also be happy to make some money from people who neither want to get screwed nor want to pirate a game.
In the end it is great to have a choice. Customers are free to decide, and this is a good thing.
"There is no right life in the wrong one." (Theodor W. Adorno, philosopher)
"Only a Sith deals in absolutes." (Obi-Wan Kenobi, Jedi)