Originally gurochan was just a place where people repost stuff from pixiv and it still is. There is some original content being posted but not that much. so there is no reason for very big traffic.

also while it is relatively free site, it is pretty specialized to guro only, and it does not even allow real life pictures so this naturally limits user base.

I wonder if admins are even interested in more traffic, because if they were they could introduce more content types and become more universal platform.

Adding extra non guro loli board may be useful to get more users since lolicons do not have that many places to go.