He had data to back his claim. He has not posted the slides yet.
An example: Omnifocus ($20) has sold 50,000 copies, and made the company $700,000. It is selling at a consistent rate, no race to the bottom or gimmick app. It rivaled (if not beat, i can't remember now) Flight Control in profits
Also, I was not saying "All $50 dollar apps were top grossing", I was making a point that you do not have to make the next flight control to be able to make a reasonable profit (thats not to say that you don't need a good product to make a profit)
An example: Omnifocus ($20) has sold 50,000 copies, and made the company $700,000. It is selling at a consistent rate, no race to the bottom or gimmick app. It rivaled (if not beat, i can't remember now) Flight Control in profits
Also, I was not saying "All $50 dollar apps were top grossing", I was making a point that you do not have to make the next flight control to be able to make a reasonable profit (thats not to say that you don't need a good product to make a profit)