Well, there are roughly 2.66M users from Indonesia, it's #20 in the list of countries by number of users on Steam.
But as it's #102 country in the world by GDP per capita, people aren't exactly buying a lot of games for obvious reasons.
2 million is a lot but since 90% of them only own Dota 2 that isn't really impressive
I feel heart-wrenched when I see Dreadout have Indonesia on number 3 as its most number of owner. Even you guys from Russia have owner than my own country folk ;__;
With long history of piracy,even with fair regional price where everything is almost 40% cheaper from the USD price, it'll take sometime until Steam really takes off here.