Seems to be blaming a lot of ills of the App Store that are larger or unrelated than the top list to the top list. Rich get richer is just the nature of the beast in capitalism. The rock bottom prices are more due to the elasticity of price of phone apps compared to many products. After all, you have prominently reported top lists for movies/games/music for decades and they certainly aren't getting cheaper. Top lists…
Other than releasing the Android source, Google doesn't really play any part in most Android devices on the market. Further, their store is plagued with malware and shady apps that never get removed. I know because I've reported them and continue to see the same apps by the same developers on the Play Store.
On the manufacturer's side, they rush out devices with subpar hardware (and hardware bugs), build, and software. And getting system updates is a game of prayer.
It's important to remember that for Google, Android is a means to an end: to get people using their services and in turn get eyes on ads and gather demographic info. They aren't selling Nexus devices at cost/a loss for nothing.