This doesn't compute: is the claim Apple badly manages its bug-bounty because 0-days are too valuable? If that's the case, I'd expect the opposite effect: Apple would recognize how valuable the reports being sent to them by white-hats are, and would react with a sense of urgency and gratitude. As it is, Apple is behaving as if 0-days are worth very little, and not a big priority.

According to Zerodium, iOS exploits are cheaper than Android exploits because they are so plentiful in comparison.