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I can back up his claim. I work for a large entertainment company that has a top 50 app, (in top grossing) and it consistently brings in hundreds of thousands of dollars a week. When it was at its highest, around 15, it was bringing in about 400-500k per week.

It's a Mac app, not an iOS app?

https://blog.kapeli.com/my-year-in-review-2014

The article is a bad piece of journalism based on a single sample -- a trivial app that just happened to stay on the top for a short while due to momentum.