Number should be used in both ways. If the US have a population k times that of Sweden, there are k Notch-likes with possibly k times the revenue of Minecraft,

Number should be used in both ways. If the US have a population k times that of Sweden, there are k Notch-likes with possibly k times the revenue of Minecraft, hence k times the potential taxes. The revenue might be considered equal as both Sweden and the US export to the rest of the world (another fallacy of your argument was that Sweden exports to the US and the US only exports to Sweden).