That's not true. There are repeat customers, so you probably mean app sales not customers. Even that isn't true, since there are in-app sales that go through Apple.
OK, so you're arguing customers spend <= 10 dollars per app on multiple apps. How many apps? These arguments are being used to make the case that Apple deserves to earn $20 billion USD per year, or even must. I think if you're going that far you should be able to at least support that with napkin math instead of hand-waving.
There are two facts you are not taking into consideration, instead you chose to attack something I didn't write. Those two facts are:
1. A Customer is not the same as a Sale. There can be muptiple Sales per Customer.
2. App Sales * Avg App Cost is not the same as Total Sales. There are also in-app sales.
> I think if you're going that far you should be able to at least support that with napkin math instead of hand-waving.
If I find a game I enjoy, I will usually give them 5-10 and play until it gets ridiculous. I don’t want to play a game for a month, check up on it every day, etc.