That's not entirely true. Most developers don't think about monetizing their apps until they've been on the store for quite some time and have show to be popula

That's not entirely true. Most developers don't think about monetizing their apps until they've been on the store for quite some time and have show to be popular. It's a common mistake among many people, but it also shows that the developers are thinking about the users first (and not money). It's easier to monetize an already successful free product than to turn a monetizing product into something successful.