Do you feel newbies are being misled? Isit not the case that older hands are sufficiently aware of TC's proclivities? Is it not enough simply to flag the contributions when they are clearly wrong, or down-mod stupid, irrelevant or content-free comments? What would banning them add? Is it impossible that they might yet say something useful?
You can't downvote submissions and TC is great at linkbait headlines, which get upvoted before people read the actual post. That's the problem.
This suggestion may seem a little odd, but how about only enabling the up arrow once the URL has been visited? (via that javascript visited link colour trick, perhaps) It won't stop deliberate thoughtless upvoting, but nothing will.