I read HH messages, but find that often the same question is posted as a thread on this forum. Frankly I find the Grumble forums much easier to use. Maybe there is a filter I can set up to change it that I am not aware opf, but with HH I see the replies in my message list before I see the original post. It just feels clunkier, if you know what I mean. With many of the same people posting in both places I don't worry so much about missing something.
As for my own Grumble participation: This summer I worked in a shop in a shopping plaza that was strictly destination, no one ever wandered in just to take a look. In September I moved to a brand new shop on a busy corner, furthermore I didn't have internet access in this location until this past Tuesday. At home I read the Grumble after my son has gone to bed ( after two stories and an hour and a half of me explaining why he can't have another story , why don't I just read him another story, it would be so much faster?) I find myself interested in reading, but not lucid enough to make intelligent contributions, so I post less often.
I like to think that people aren't posting as much because their shops are busy.