That's not what I was implying at all. It's not about money. If a person learns to actually write software on their QA job, why would they not do it for a living? In most cases, it's a more satisfying job to have. The assumption I made was that if a QA person who also reviews code a lot becomes really good at the job, they are very likely to try and become a developer themselves.
It's too bad that there isn't real competition on iOS app distribution.