For every true developer doing it for the challenge, there's two dozen desperate wannabes who will steal it to try and make a quick buck, and it's a lose-lose for everyone. This is why the Wii & Wii U modding and homebrew scene died, it's why the iOS jailbreaking scene died, and those are just recent examples.
Hmm, interesting perspective. I guess from the other side though, a lot of us nerds are constantly berating these companies for not being vigilant enough when it comes to security.
It's possible I guess that the security holes that allow us to jailbreak platforms to exploit other functionality could be considered "beneficial" but I suspect the reality is if those holes exist, it's just as likely they can be exploited by malicious actors.
If the net result is more secure software - that stops us jailbreaking - is that a better or worse outcome?