You brought up population, GDP, average income, etc. None of these explicitly support your claim, half of them actually work against it.
I gave you actual numbers for Linux usage and they do not support your assertion. I would have appreciated the same from you given that you are absolutely sure.
I don't get what's so hard to understand about his point. There are more people and more Linux users in Europe, but each of those people has (way) less disposable income (money left over to spend on luxury goods) than Americans.
Thus, it makes financial sense to sell to Americans first and foremost, as opposed to the more numerous Europeans.
Meadian household income isn't great for this. I know here that I don't have to pay for healthcare or schooling and I'm sure many other things in America that are deducted after income.
I gave you actual numbers for Linux usage and they do not support your assertion. I would have appreciated the same from you given that you are absolutely sure.