I did my own little run through of posts up until Smeags' first list, and did some basic, rough calculations. Note: I didn't consider shallow questions/answers much of a contribution. Also, this is very relative; I relied on my feels.
No activity: RTC, IkePoR. Never good in my book.
I have a bad feeling about outlawauron. His posts feel so shallow. He tried to answer my question, but didn't really... Not paying close attention? Other shallow/casual posters who seem like they're feigning interest (just a feeling), and have a somewhat low contribution-post ratio: Cone, WhiteEaglePL, Mr Khan, and Smeags a little.
I can't read spurge at all.
*I created my list before taking a look at Smeags' second list, so I could compare without fear of influence. Worth noting, although not what I had hoped honestly, is that both our tallies regarding what constitues an actual contribution are very similar.