Here's the single biggest problem with your analysis. Given the price of the average Mac, in many countries just the pricing structure limits the market of potential buyers, meaning that a HIGHER percentage of creative professionals, app developers, etc. would be buying these machines in those countries because there is a clear benefit from a business perspective. If you're going to turn the analysis to a global perspective, then you must by default also take into account factors such as economics, relative wealth between nations, access to these machines in the first place, etc. You seem to have attempted to apply a "one size fits all" approach here, which grossly overestimates the number of non-creatives who pick up these machines overseas. This is ironic, given your admonition to "widen your horizons".