That is quite odd to be honest, Im surprised to find that this happens with such new stories, Old stories, fair enough because there would have been less members which leads to less comments but new stories? It's a mystery to me. Maybe people who binge read don't leave comments as they want to move onto the next new story?
I usually try to find some things to comment on, however sometimes I may want to quickly read the story/ chapter. Sometimes I wont comment because I want to see how things play out and sometimes I just don't comment because I'm not really sure what to say, or I don't think I've got enough to say to comment. When I do comment I usually express how I feel at the time during the story and what I'm thinking at the end of the chapter.