Study Google Play and AdMob on the example of a single application

My free app on Google Play is turning into a year. During this year I managed to collect 77.5 thousand installations in total, 22.5 thousand active installations, earn $ 75 on in-app (15 of which disappeared in an unknown direction), as well as $ 364 on AdMob advertising.
Of course, I will not provide links, but I would like to share with the community some statistics of this application.

Some facts

• The application was published on May 8
• the app is entertaining but not game
• the application was made under the group VKontakte
• the application exists at the expense of an external server and daily content from it
• application stagnated (did not receive content updates) for a total of 4 months
• the application checks the content on the server offline (which is not very good, I want to change this system)
• The admob ad unit was originally built into the application, as well as the ability to disable it for $ 1
• ad units rotate every 30 seconds

Several graphs

Scatter devices


As we can see, Android 2.1-2.3.7 is still quite common (considering that some still not only sell, but also release devices on it). However, there is a tendency to decline (or my application normally works only on 4-ke :))
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Rating chart


At the marked point is the rating before the update, in which the user is unobtrusively and friendly invited to rate the application in 5 stars. After the fracture, the rating is kept at 4.8-4.9

Installation schedule

The turning point is a recent store launch on April 1, at which I was on the main one (Two problems appeared at once: they forgot to pay for hosting, and the server load was greatly increased due to a hidden bug in the application)

Deletion schedule

Fichering brings upset in the form of heaps of deletions :)

Advertising schedule

You see the profit chart for the last 90 days, grouped by week.
The profit schedule is strongly correlated with the schedule of hits, so I see no reason to bring it. I note that from April 1 to April 7, there were 820 thousand ad impressions, CTR 0.34%, eCMP $ 0.05

Conclusions that I made for myself.

So, in the process of working with the store, I made several conclusions for myself:

1. I will never get money from purchases inside the app. Well, seriously, the payout threshold is $ 100. I lost $ 15 when the store was not yet tied to the account, and had to be transferred to rapid, or somewhere else. In short, google, return $ 15, be a man
2. The mechanics of Rate this app will help you get positive feedback, but its dialogue should not be boring and of the same type.
3. Do not forget to pay for hosting, otherwise users react to it very badly.
4. To receive money from the application is very nice. But you have to work and create content.
5. Oh, this android ...

Thank you for your attention, I will try to answer your questions in the comments.