That's a superiority complex. It can be seen especially well in Russia. I've read stories that their companies even start legal actions against white hackers that submit vulnerabilities to them.
The group of people who run these corps are old enough not to be grown up with the internet, and some of them just can’t understand the dangers of this new world, even if you tried explaining it to them.
They are missing the fundamentals.
Because you're offering money if a way in is found. I feel like that's most of their hesitance, really, they probably just don't want to pay the bounties.