I totally feel for you - I felt (and feel) very much the same. My guess (which seems fairly accurate based on my conversations with recruiters, etc) is that by revealing where you sit on the list, you will make choices differently then if you were selected without such knowledge.
This is likely why they tell you not to do anything differently with your life while you are waiting - to go about your previous plans and make your decision when/if you get the phone call.
Consider this - You have an excellent CFAT score, aced your interview, etc. They tell you all these things, assure you that you are "top of the list" - then get a call regarding your credit check or security check and something is not as good as it previously looked. Not only have they gotten your hopes up but it is also plausible that by saying you were in such a position you might have quit your job and made plans to leave (etc). At best this result would likely leave you feeling cheated and your career undermined by the Canadian Forces (a negative result for public opinion, if nothing else) - at worst you might construe such information as a promise of employment which gets into (potentially) sticky legal issues.
I am sure that occasionally they let you know these details or hint on occasion regarding your suitability - but as far as revealing your odds of selection the best they can say is "you have a good chance", not "you did better then everyone else, here is how". Can't stop them from being human and wanting to give you an answer, but revealing your CFAT score would likely give you grounds to feel "cheated" if you were not selected, or oppositely feel the test didn't do you justice (if you had a poor score).
Again, I do not know the official policy - a recruiter's comments would be most welcome if I am in err. I believe I am not far from the mark however. I'd love to know my scores, etc as well - but after thinking about it I am starting to get a much better idea of why they keep such information to themselves.
Edited for grammar and clarity