How do you figure that one ?
A game here is $5.99 US regardless of where you are in the world. Steam doesn't work that way.
If this was steam i would be paying 5.99€ which is $8.10 US instead of $5.99 US
No, not at all like stEAm.

As an Australian, I always assume $ means US dollars in online stores unless it's explicitly typed as "AU$" or it's an Australia-based store.

I've made a suggestion to the site devs about this issue (just in case anybody else was going to do so).
Obviously I do too (though I never realised it), but not everybody is going to make the same assumption; especially people who haven't purchased outside of their country before.

Yeah, and we want to keep it that way. When Steam produced a GBP version of their client, you can bet it was bad news for UK customers. It 'conveniently' came at a time when the pound was at an all time low too...

Not quite like Steam; GOG's prices are the same wherever you are. 5.99 or 9.99 US Dollars. Steam and other direct download services are allow publishers to set different prices in different regions. For instance a game could cost 29.99 USD for american customers and cost us brits £29.99 pound which amounts to about 49.51 USD. The same thing happens for those in the Euro zone. The only thing that fluctuates prices with GOG is the exchange rate and they really can't control that.
You should probably email GOG about that FAQ though I am sure they would wat it to be as clear as possible. While the $ sign on its own almost always refers to USD when taken in an international context, it is easily understandable how someone who local currency also uses the $ sign might end up in the same situation as you have.

No they're not - a USD$5.99 game from GOG will cost you USD$5.99, no matter where you are located. Try buying a USD$19.99 game from Steam while in Europe, and you'll end up paying €19.99, which is roughly USD$28.95.
Same price everywhere on GOG, unlike Steam who uses the same number in (at least) two different currencies (note, I only compare Euro and USD because I don't know how steam prices their games in other currencies).

And it does a great job at pissing people off. I haven't bought 1 new game since they've pulled that stunt together with about 50.000 fellow gamers. That's why we buy our stuff in cheaper places because here it's way to expensive.
bloody steam theieves. I hate them more then signpost quests.

I don't know about NZ, but interestingly we Australians still pay in US$ for Steam...

We do too

Oh my mistake, just probably getting mixed up due to Aliasalpha's regular moan about Aussie prices. I shall edit my post so as not to mislead anyone, thanks for pointing that out.

I notice that Steam now displays USD after the price for ROW regions still using US dollars. It's bloody ugly if you ask me, but I guess it helps for regions who actually use a form of currency with the same $ symbol.
I suppose it couldn't hurt for GOG to add a note on the checkout page that all prices are charged in USD. In the "Purchases at GOG.com:" section displayed on the right hand side of the screen, or next to the final price displayed by the "Process my order now" button.

I think he moans about retail prices, which are often insane for new console games.

To make it clear, they would be better off changing every instance of $* to $* USD, else people WILL miss that single place it's specified at.

In the order summary email you get when you buy a game it does state that the price is in USD.
(all prices displayed are in USD and inclusive of 15% VAT)
However, they do have issues with the receipt calculations. They say the prices are inclusive of VAT but then they calculate VAT based on the price.
E.g. VAT here in UK is currently 15%. I bought a $5.99 game and firstly in the price breakdown it just shows 599 (no symbol or decimal point). Then it shows VAT as 0.90 which is 15% of 5.99 - however the price is supposed to INCLUDE VAT, so the addition of this 0.90 is wrong. AND THEN they don't use the calculated 0.90, giving an order total of $5.99.
In any case, the price charged is correct so I've no problem with that, but they ought to sort out their email receipts. If they want to show VAT then they need to, for a $5.99 game, display it as the below:
GAME TITLE ------------ $5.21
VAT (15%) --------------- $0.78
TOTAL -------------------- $5.99
Or just not show a VAT line and state only that it is inclusive of VAT already.

And it does, since you don't pay $5.99 + VAT, you pay $5.99, thus 5.99$ already includes VAT. I don't see anything wrong there.
No, even if VAT is included in the prices on catalogue, they still have to let you know how much VAT they're charging.
But i agree with you about the room for improvement in the mail receipts I really dislike the horizontal distribution of items on purchases of multiple items, for instance. And also the 599, 999 thing you mentioned.