No doubt about it, some comments are more valuable than the posts themselves, and it's all about staying on topic. And then there are the comments to comments where sometimes you find some gems. I don't know, but it seems to me to be a no-brainer for authors to do their best to bring the best comments to the top and make them standout in a social media setting that distinctly allows the author to effectively do just that. I don't know why more don't.