@magicalclick: There are people I work with that watch the videos (I noticed the Eric Lippert video today on a collegues screen) but never participate in the forum.
A certain way to get more traffic is not to be so heavy handed on trolls, but then the site becomes terrible as the flame-ways are fought.
I am sure that the C team are more focussed on the content delivery, with the forum as a bonus. Stack overflow is great for answers, but no real dicussion occurs there. Commenting on Arstechnica articles can reach the many hundreds, and again that is rather fragmented.