Indeed. get yourself that insurance.
It may be another 7 bucks every month, but who's to say that you don't crack the screen again? or something worse later on down the road, and then not have the insurance to save you???
To put it into perspective, sure it's another $7. But you are paying that much at least 5 times over to actually use the phone. You don't want to risk not having that kind of back-up.
I kind of wish I had some insurance myself, even though I haven't killed my Diamond yet... (knock on wood)
You never know whats going to happen.
EDIT: by the way, as long as you flash back to stock and relock, it is likely that they will never know. ever. (most of) the people selling you these devices don't know half of the capability of them.. and definitely don't know about this wonderful community!!!
