Do historically noticed posts contribute to reputation?
If they do, consider this a feature request so that they do not.
A historically noticed question “is not considered a good, on-topic question for this site”. Therefore it should be deleted from the site. We are keeping it visible so that the content does not vanish from the Internet, that's why the question is not in fact deleted. But apart from being visible, it should have all the characteristics of deleted questions: no voting, no appearance in Stack Exchange search results, a visually distinctive appearance, and no reputation.
Please read Aarobot's answer to the latest deleted-but-visible discussion, it's a very good explanation of the issues.