I live in developed country seems like the price is same with other currency, however you can buy bitcoin here without tax so i think i might agree with you that bitcoin is more cheap here but price differences between my currency and others is not too far away, it must be tax charges or something that caused additional fee, that's why bitcoin in somewhere is cheaper than others.
Anyway i never checked the price differences before.

I do not think there will be people who want to launch an arbitrage with exchanges in various countries, because I think the advantage will be cut by the fee

That's kinda interesting.  OP wants arbitrage opportunities, and I'm always kinda surprised when bitcoin sells for different prices on different exchanges.  Usually, like in stocks, those opportunities don't last for long because traders are always looking for and taking advantage of them.  In the bitcoin world somehow it seems that people aren't doing it...because the price discrepancies persist.  I wasn't aware that bitcoin was valued differently based on the currency.  It would seem that shouldn't be how it works.

The value of bitcoin in all kind of the currency are same and totally the developed or development country are not giving any effect for that. because the tax is just depending on the miner charge and the exchange charger. totally wrong in your statement.

https://btc-e.com/exchange/btc_rur

You are talking nonsense, prices are relative not absolute.

The value you are transfering is absolute   1 BTC = A *  USD = B * RUR = C * CNY = D* EUR ,etc etc

Where   A* USD = B* RUR, where the A/B is the USD/RUR rate and so on, but they all equal 1 bitcoin.

This is similar to thread that I've read from this forum months ago. The OP of that thread was asking in which country is gold the cheapest and that he was asking that to buy from a country that sells the lowest and then sell it to the country that buys the highest. One guy replied that even if there are differences with the price of the gold, if he were to travel into another country and sell it there, the transportation fee and all those stuffs will just be the same as the profit. Meaning, he'll not earn any money.

I think that can be applied here too. Even if there are small differences in the bitcoin's price in different currencies, you'll still not earn any profit doing it because of the exchange fee, transaction fee, etc.

Yes you are right, in the developing countries there are zero taxes on so many transaction that take place, I mean even normal transaction not to talk more of bitcoin that is not even known by most of the citizen. It does not attract attention to the government, so they do not even think of taxing people who are using bitcoins.

Lol I think in any country, there is no given bitcoin transaction taxes dude. I think it makes no sense to be given taxes. even if you make a purchase and sale bitcoin in any country in any exchange you will not be given a tax. so the actual price difference is not about taxes This is pure arbitrage

Yes! it is very possible, As far as I know not all exchangers have the same price of bitcoin, there are some exchange bitcoin is too high and some are not, try to check the different exchange platform you will see the difference.

From my point of view and my limited (but somewhat long) experience trading with Bitcoin, I think the most important factors is on the trading platform you use. For example, certain platforms have higher fees which result in seller or buyer trying to regroup their lost over another the other low-fees trading platform. One example is CoinHako who only accept SGD and MYR and they charge 0.9% for each transaction. OKCoin on the other hand only charge 0.20% fees for transaction. If I am right OKCoin China website do not have any trading fees at all - correct me if I am wrong.

TLDR; Most probably affect by the trading platform fees and what currency they accept. Not the currency itself.