This is called "natural selection". You are currently observing an app-store customer in the wild, seeing its habits and preferences. You can't get another, domestic, customer because they die out in the cages from severe ADs overdose, so you are left with only two choices: 1. Do nothing new; 2. Learn how to interact with existing, wild, customer population, who, oh blasphemy!, doesn't like IAPs.

Your apps. Your choice.