NIce that you ask :) It definitely is partially a case, we're encouraged to support each other and comment on each other posts (not only upvote)....but to be accepted to our group, there's a selection process and filter under supervision of @jaynie and @zord189....you're content need to be up to par + your interaction as well..you actually have to join another discord group first where you have an "application interview" to decide whether you're allowed to the "real" discord or not haha :D
Sooo yeah, it definitely is case that many comments are our own buut not only. Personally speaking, my comment section is usually 50/50...great question tho!
Glad your comment section is 50/50 - it'd be a shame to restrict yourself to commenting on one group only, although it's clear to see the love there. So many amazing things happening on steem! Thanks for your reply.