Possible Duplicates:
Should users be discouraged from asking new questions until they’ve accepted a certain % or deleted old unaccepted questions?
Please charge rep for questions after threshold
Just a suggestion - but have a look at this question - this user has been given some good answers to their questions and have given nothing back to the community offering them help... it clearly annoys people within that community - look at the comments!
Maybe users who have asked enough questions to have an accept rate calculated need to attain a minimum acceptance level, say 25% before asking any more questions...
just a thought...
Update: Thanks all for the feedback - I understand that the original suggestion was a thumping bad one, for the reasons given...
as you were, everybody - sorry to have bothered you ;)