Hi John - I agree with most of the comments on this thread. One thing especially with having Informative being more weighted than Agree to encourage and validate well thought out comments.
So one thing I always have to remind myself and the groups that we represent is to not take some of the basic things for granted. As you mentioned in the original question we have the 80/20 rule whereas 80% of the voting is done by 20% of the audience. It may be a good idea to do one or some of the following to ensure everyone know's how to use the site:
1. Information bubbles when you hover over each of the buttons (Reply, Agree, Disagree, etc.) Maybe to each of us that are reading this we take it for granted and you may say Dave are you kidding me? That's too 101 but remember not everyone may understand the exact meaning of a vote it should be relatively easy code for your developer if you deem this a viable suggestion.
2. Create a tutorial(s) on how to use the site. Also, suggest how voting / engaging not only benefits you but it rewards the individual that took time of their day to share their wisdom. Alright, I must say that I appreciate much of the humor that I've come across on many of the threads and keep them coming! :) For example, (and I'm a little embarrassed to admit this but I'll say it anyway), I don't know how to do this:
How do you select copy from a previous commenters post like shown above? If anyone can help me with this that would be greatly appreciated!
3. For the articles that are public, they should be highlighted/promoted moreso as to garner more attention / potential subscribers.
4. Last but not least and especially since I just conducted a session at ISC West on Referral Programs that work with Bob Ryan and Mike Dove, I'd be remiss if I didn't mention creating a formal referral program or some type of incentive for us as users to refer others to become members. I did just notice today that I can invite up to 3 individuals with a free month trial which I'll take advantage of for individuals who I feel would benefit in becoming a subscriber.
Didn't mean to get off topic here on the original question but hopefully there's value in what I shared. Hopefully one day I'll crack the top 20 ;)
Cheers!