read through all the comments (half an hour of my short life gone :) :) ) ...and some good observations. There are unique individuals who stand out as regards engagement...@jaynie being one of them. Others that come to mind are @galenkp (phenomenal... how he does it while working a full time job I have no idea), @ryivhnn, @traciyork are two others....
Personally I also have challenges commenting for the sake of commenting ... if I do not have an opinion on the content I rather dont comment.