Let me explain.
$60 for Americans, €60 for Europeans. Americans get a 20% preorder+Witcher 1/2 discount, while Europeans get a 27% discount. This amounts to $48 for Americans and about €44 for Europeans or about $60. Since the Europeans are paying about $12 more than the Americans, GOG compensates them by offering 2 $6 codes.

I guess you can always TRADE those codes for some kind of gift, you know?

Ah, didn't realize the discounts would be different between regions.

That's exactly how it is.

One extra comment. The Europeans are getting 27% off, only if they have W1 and W2 in their collection. Only one game results in 22% discount, and no game results in 17% discount.

You should also know that the codes dont apply to sales. So if a 9.99 game goes on sale for 5.00 you wont be able to use the code to redeem it. Only games that are originally 5.99 apply.

How do you know this? Is it stated somewhere?

Thanks, that is a confirmation.

Can't say that I'm positively impressed by this limitation - if I'm not terribly mistaken, those Gamersgate blue coins that GOG so colourfully bashed, are more flexible in this regard.

At least it should be only temporary still till the wallet is implemented.

Hehehe. :P

Regardless of wallet implementation or not, it's quite backwards that $5.99 codes can't be used on $9.99 games when they're on a 50% or more sale. If you paid with real money, wouldn't you be paying the reduced price? Where's the difference in paying with codes of equal value?

Always check the small print I guess, I'd assumed $12 of codes would have a value somewhat close to $12 but the mess of restrictions means the 2 $6 codes are nearly worthless. Can't use them in a sale, can't combine them to buy anything worthwhile. It just comes across as a dirty little trick to con you once and burn goodwill.

You could try trading in the classifieds thread.