I could not tell you, I think many only comment for the need to have more post, I made a thread about something important and people only answered sh1ts
You can report there messages if they are just commenting spam on your post, there is a report option just click on it and report someone comments so the admins or moderator will delete there messages.
Many people only participate because they want to have 50 comments, but the vast majority when you call someone in private, this person can give you all the assistance you need