But i do not see that Steam will continue to allow this indefinitely, it is not in their best interest to scare customers off to buy cheaper games elsewhere then allow them to bring back these cheaper games and register them on Steam!
Hard to say. Steam generates keys for bundles, like Humble Bundle, and prices there are even more hilarious than those on Amazon or in Retail store. I'm not marketing guy and I don't know whether Steam got his 30% share from retail or not. They could, since game has "mandatory Steam" in it. In this case it could make sense - they still have their revenue and they consider retail/bundle copies as... Well, remember how taxes are gathered in GalCiv? If taxes are low, more people pay them, if taxes are high, less people are doing so.
IIRC at least one devepoper told that during Steam sales their revenue (not just copies sold) increased greatly, hence Steam's revenue, even if sum of money brought from one copy was much smaller.
On the other hand, it puts pressure on Steam to reject 'regional' bulshit pricing.
Think the other way - people live differently, have different incomes, so buying expensive copies is "rather unlikely" in countries with low income. So if you want something sold there, you have to reduce prices, otherwise people aren't going to buy anything.
What does irritates me are regional, or even worse - content/language locks, especially for games bought at full, non-regional prices (or prices that aren't that lower). That, combined with situation when prices are set for same numbers only in different currency, say $60=€60, makes you wishing for something bigger than large flamethrower to express your love and passion. It makes you wishing for carpet napalm bombing. Especially when you got regionally locked "back in USSR" version (yeah, borderlands 2 le scandalle) for European price.
I really don't understand why not to keep two stock units of same game (since storage cost is about zero anyway) - one is GoG's approach of "one world - one price", another are regionally priced games with regional locks. You want WW version for free multiplayer or content - buy it for WW price, because you can do that witn abroad retail, friends' gifting or buying it from Amazon. Should you want cheaper version, with possible limitations - then buy your regional one. Let people upgrade from regional to WW for adequate sum, in case they moved or simply changed their mind.
Currently it is better (and sometimes even much cheaper, alas longer) to buy from sites like Amazon, or abroad retail, or ask your friend abroad to gift you something, than to buy "castrated' version in your Steam store.
To express my love and passion towards porrigin, I need something bigger than carpet napalm bombing, probably whole Sun (sorry, Sun, but that's ablsolutely necessary) - they sale not just regionally locked, but language locked versions... in language locked stores. I can't understand a darn thing, what I'm supposed to do there?!
And their prices are exorbitant, for regional and language locked stuff. And some people warn me about ME3, yeah, right, sure.