If the intent was to keep up with inflation in a way that maximizes local profits, pegging to the US dollar makes no sense. The games wont sell at this price in any appreciable number. Steam could have easily used other tools, like some dynamic pricing model, to maximize local profits. The only thing pegging to the US dollar does is combat key resales, as the comment you are replying to implies.
If the intent was to keep up with inflation in a way that maximizes local profits, pegging to the US dollar makes no sense. The games wont sell at this price in any appreciable number. Steam could have easily used other tools, like some dynamic pricing model, to maximize local profits. The only thing pegging to the US dollar does is combat key resales, as the comment you are replying to implies.