Barely anything on reddit is original content, I don't think the users should complain about reposts on other sites. If it keeps certain demographics away, it might even be a good thing for reddit's content/comment quality.
On the contrary, Reddit (and particularly smaller subreddits) contain some of the most active and intelligent conversation available to vast general audiences on the web. AMAs alone spark a lot of interesting dialogue. Nick Eftiamiades' yesterday was really enlightening (http://www.reddit.com/r/IAmA/comments/zchnb/ive_appeared_on_...). The hivemind can be embarrassing, but there's still a lot to glean from such a userbase.