Looks like most users already have the apps they want and don’t need any more. Also it just is’nt that easy to find apps apps. Apple’s App Store is rightly criticized terrible navigation and search in the app store. Most users says the report “relying on the top 25 lists, a bad search engine, and few editorial features”.
Well they still use their smartphones to search the web.
Read the article for all the details http://qz.com/253618/most-smartphone-users-download-zero-apps-per-month/