That's the point of statistics - you take a sample big enough to give you an accurate estimate, using various statistical methods.
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You are really stubborn, aren't you?
alaschu, see my 1st link. Right under the chart.
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1,500 people isn't even a fraction of the gaming public.
It's not possible to create an accurate picture.
You'd need sales data, what got sold and to whom for what purpose.