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This is probabely too far down, but I suspect strongly that the paid apps market in Google Play is entirely broken. In Germany you need more than €2000 income a month to survive properly. Because of taxes and insurance, you will have about half of that to live. Rent is another half, which leaves you with €500 to eat and pay for everything else. And that is all only of you can have this income every month.
That being said, when I look at top paid apps in several categories, they do not make enough turnover to even last a single month. Just an example in Germany the top paid app in "learning" only has 100-500 installations and costs €1. And you have to pay Google Play from that as well. If that app took more than a week to produce, it lost money. And that is the top paid app for that category in Germany!!
How do you make money on apps in Google Play? Only with advertising in free apps? Or is it just a big scam by Google?