RWarehall: This also may have something to do with the way VAT is changing. There might be some reason they will have to offer games in Euros.
011284mm: You are about 85% there with that.
The link at the end will explain it better then I can, but, as of the 1st January 2015 all digital supplies within the EU must add on VAT at the place of purchase (they can choose to add their own too if they like). This means that when I buy a game from GOG they will have to offer me the game with VAT at 20% (current rate until October 2015). Then they will hand over this to HMRC and then keep the profits.
They can use my IP address to verify I am in the UK and not elsewhere, but as they are basing their company in Cyprus which is listed as a tax haven, I guess soon I will have to provide postal addresses or let PayPal certify me to continue being able to buy from GOG.
A US citizen and others outside of the EU will not be affected by this yet, but you will still be paying the Cyprus tax as that is where the financial transaction takes place.
I can see GOG ending their money back deal soon after 2015 begins and the price differences taking a second hike as they add in the additional taxes - the original reason for us loosing Amnesia: The Dark Descent was that GOG would not cover the VAT change, to the publishers detriment, so they pulled.
http://www.hmrc.gov.uk/news/one-stop-shop.pdf Actually I doubt that is the real reason since gog has to pay 19% VAT to Cyprus at the moment for every purchase made - just check the applicable tax rates at the Cyprus tax office - VAT there has increased every year now and I would not call it a taxes haven anymore.
The other thing is that the EU Commision is pressing down on online shops that are evading taxes like Amazon Germany who only pays 1% VAT in Luxemburg, etc.