Pheace: Wonder how they calculated that. 43.79 Euro is about $59.81. That's $16 difference with the US version, ie a 9.99 + 5.99
Grargar: 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.
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.