most downloaded gaming apps vs most expensive cost per installs (CPI)

The above chart shows    the share of global gaming app markets in term of downloads, and the CPI ( cost per index)

Gaming apps are led by 1)Strategy games.2) Simulations 3) role play 4) Puzzle and Cards respectively.Strategy gaming apps have the highest marketshare among gaming apps 

The Y axis shows he cost per installs of the same gaming apps. As with everything Its the logic of economic demand and supply that comes into place  here . Publishers/developers  would want their apps be present across " high volume and high engagement categories like  " Strategy" which has the highest category marketshare.". Naturally this will have the highest CPI ( cost per installs 
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