[problems]

> It's no secret that jailbroken phones are less secure

There is no evidence that jailbroken or rooted users have resulted in any significant compromises.

At least in the Android world, you must still approve any application which wants root access and rooting your phone allow you to gain access to some pretty impressive security tools you otherwise wouldn't have available to you. Generally speaking, users who are rooted or jailbroken are sophisticated enough to handle this on their own - and often use it to improve their security, not damage it.