Steam prices

That's just them not noticing; the Thai market isn't really important to them so they don't focus on it. I guarantee you if Thailand was as large a consumer market as Russia they would figure out their pricing immediately.

Put it this way, they make 60% of their income from the US, 30% from western Europe, 8% from Russia, and 2% from the rest of the world. Obviously they're going to focus on the profit centers -- which explains why all the games we see are so westernized, with American and European accents, default English, western appearances and sensibilities, and for shooters they're usually from the perspective of Americans being the "good guys." It's just catering to the people who make you money.

Well, it seems we are almost in the same boat ,so don't take it personally, this is just how the world goes ;D

Disposable income. I'm not even an American by nationality and I grew up in Europe, so I'm not sure what you're really accusing me of.

The simple fact is that after taxes and essential costs, Americans have an absurdly higher amount of disposable income. Germany is very high up there too, but even it's not close: http://en.wikipedia.org/wiki/List_of_countries_by_per_capita_personal_income

This is a result of a lot of things, from America being absolutely huge so people can pay less in taxes individually but when it's all combined it adds up to trillions, to economies of scale and the availability of things like open land for development, farming, etc. The point is, Americans earn the same (or less in some cases) than people in comparable developed nations, but after they've bought their food, paid their taxes, and are looking to buy luxuries like games, they have a lot more to spend. There's a reason every company and marketer looks at the US first.

Note: This has nothing to do with how well-off people in some parts of Europe are. For example, I'd argue Swedes probably enjoy a much higher standard of living than Americans. But the thing is, they pay a lot of money into their taxes (upwards of 60%) while Americans pay around 15%. That's pretty notable in terms of spending money. Of course, it also means things like healthcare end up being issues.

Well no argument here, that means we get the bad part of deal ;D

What country? It could be that your country is just too small to matter to publishers so they never really bothered to do market research and figure out what price to set their games at.

It could also mean that people are accustomed to high prices and are willing to pay that regardless. This is actually pretty accurate for a lot of Europe, since they don't have the same scale as the US which ends up making most products pricier. For example, America has huge access to oil, so gas prices are way cheaper. In the same way, things like TVs are cheaper because the US has 300 million people looking to buy them, so the transportation and infrastructure costs are quite low per capita. On top of that, food in the US is laughably cheap because of the huge amount of farmland available. Because all this is so cheap, Americans aren't used to paying a lot of things and aren't as willing. The converse applies to Germany for example.

Ultimately, companies do extensive market research to figure out what prices yield the highest profit margins and set products at that. It turns out, in places like SE Asia those prices are extremely low and there really aren't any profits to be had, so they have to rely on western markets to stay in business.