there's really no benefit to jailbreaking iPads for the vast majority of users
The main reason why most people jailbreak is it get access to iPad's file system which in turn allows to install IPA files directly (just like running installers in Windows).
This is the reason why Apple does not allow file access. Otherwise people will start installing cracked apps without paying for them via Appstore. Also if you become "root" user, you can literally do whatever you want with iPad and it transforms itself in the zone of netbook/laptop (minus keyboard). Apple also doesn't want to make iPad too powerful otherwise who will buy overpriced Macbooks (which is again nothing but Unix with nice graphics)?