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.
There's a difference between posting something from another site, even if it's a screenshot, and scrubbing the watermark then adding your own in an attempt to claim authorship. Reddit does the former, 9GAG the latter.
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.
