I'm all for CoD on different platforms but if you think about it, CoD is a niché game on the PC platform which most likely means small sales. Now imagine this niché game on a platform that is roughly 90% smaller than the PC market and you have very little to almost non-existing profitability chances. If other platforms are profitable CoD will probably make it there so hold your thumbs but just don't hold them too hard
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P.S Imagine the price tag on the Mac hardware that is needed to run this game, probably get 2 high-end PC's for the same price. Just saying....