Mostly what I've seen on the various forums it's the same hand full of people that post in that group, if a few of them get a little busy then they seem not to pass comment or post anything and as there is so few regular people that post then the forum goes quite.
If you take this forum there's yourself George, John, Derek, Pete, Les, Bryan, Dennis, Andy, Mike, Tony & Di, Wolfgang, myself (sorry if I've missed anyone) but now I'm having to think hard on who post regularly. Mark S & Eric pop in from time to time. So if 2 or 3 of us stop posting for a bit then you have lost nearly 20% to 30% of your posts.
I for one have not been so active on the forums lately as I've just seemed to be getting busier and busier so I just use FB while I'm having a coffee in the morning. I look at the forums only about once or twice a week. Post a few comments, miss half the posts. But then my time management is crap!
Also I've notice that woodturning slows down June, July and August I guess that the most of the people that do woodturning find other things to do during these months.
Now I lost another 1/2 hour on the AWGB forum
All the best
Ed