As for daily contributors I'd say you have Mr. C, Dexter, Patrickl, Wunder. I used to be one, but my posting there has dropped off sharply and I'll frequently go weeks at a time without posting there now, and when I am participating it's usually only half-heartedly in one or two threads. On top of that you have periodic posts from Dartful, Ed, Frizzle, Saint, pinballjim, polaris. A few others make occasional appearances ,e.g., Fredster, who used to post multiple times per day, will show up and post something once or twice a year.
I wouldn't be surprised if 6 is an exaggeration of the average number of people contributing on a given day.