Every progress mankind made, every invention we did, was either just dumb luck or figuring out an alternative use for something we already had.
Being a Hacker means having the state of mind to make this progress possible.
Wanting to know how something works and in what other ways is it usable.
This mindset gave us the leaps in science and arts in general. It is just that when IT is scrutinized those new features happen to result in security vulnerabilities.
That is why more and more companies adopt that vulnerability reward programs.*
But the financial reward is not why hackers do it. It's all about autonomy, mastery and purpose.
* Last year Mozilla and Google rewarded over a million dollars through their bug bounties.