I personally hate that different regions pay different amounts, I know it makes sense from a selling point of view and that's how markets work, but it seems kinda annoying really when it's all digital. This especially when they up the cost massively for places like Australia. I always wonder how much of the cut goes back to developers for these price fluctuations or how much just gets swallowed up in conversion taxes and whatever.
In Australia $10 is like half an hour wage, whereas in somewhere like Indonesia, it's like 15 hours wages. Yet the market in Indonesia is 10 times bigger, so they still have the potential to make lots of money by selling a game at $2. But a $2 game in Australia would get less sales, unless it's on a medium where game prices are low (like Google Play).
You've got every right to be annoyed by it, but that's how it is. From a value perspective, the game might give say... an hour of fun to an Indonesian or Australian, and if they paid the same price, it'd still be unfair to the person whose currency is worth less.
Still, it's nice that Steam and Google Play have been driving down prices for a while now. Software pirates selling pirated games in Malaysian shopping malls were abundant 10 years ago when I was a kid. These days, the price for an original game on Steam is about the same price as buying from a shopping mall pirate.