Google shot themselves in the foot by pushing free apps to the detriment of everything else in an attempt to bolster their usage for ads, and their personal footprint. They are basically like the online newspaper industry if it was run by advertisers. It's too late to try and push $5 apps now or try to have a successful newspaper online behind a paywall. The genie is out of the bottle. Google shouldn't have pushed the going rate towards free, so now only clearly superior efforts even warrant a consideration for purchase.
Studies show that 90% of the apps iOS users have on their iPhones are free. Must be contagious.