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Security purposes?
So you cannot install an older jailbreakable firmware version.

Bingo. If their opinion on jailbreaking was "quite the opposite", they wouldn't have this sophisticated system where Apple has to sign off on each update, because the *ONLY* people who would ever have any incentive to downgrade are jailbreakers.
 
One of the main reasons people jailbreak their devices is to install apps that they have not paid for. You can argue that the reason is to innovate and take control of your own device but the bottom line is theft. Apple protects its app devs and it's own bottom line by securing their devices. I'm sure I'll receive hate for this but it's true.

Perhaps we should make this a poll.
Would you still jailbreak your device if it did not allow you to install Apps that are for purchase only, but did let you install non-Apple-certified apps that were free. As well as letting you customize your user experience.?

I would have thought most JBers do it for the tweaks/customisation over the cracked App store apps.

I've never been interested in doing the latter, personally.
 
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