This is not something reddit can fix, and I fear that reddit will meet the same fate that digg has recently met. Both digg and reddit gained users at a steady pace, then skyrocketed in users and plummeted in intellectual value. On both sites users complained about how the site had changed but no one listened or cared. Eventually, as all the intellectually curious users left, the users that remained realized they are no better than 4chan and began looking for a new home as well. I believe this is an inevitable cycle for all social news websites. I wouldn't be surprised if in a few years I am fleeing Hacker News for the same reason.
I'd love to hear what some of the reddit admins think about how reddit has changed over the years, seeing as you all have had a better perspective than anyone else on reddit's evolution.
Good luck monetizing reddit, I will most likely donate some to show my appreciation for all reddit has provided me for the last couple of years.