I don't believe the point of posting is to get hits, it's actually two-fold: 1.) to get in the practise of putting your work out to the world, 2.) getting constructive feedback. Posting in these galleries achieves the first point quite well, hence the focus on how many "hits" we get. However, few people are willing to say anything more meaningful than "wow! this is great!" or something equally vague. Don't get me wrong, I'll take the "this is great!" comments, which for my work are rare. However, those types of comments matter far more to me when they are made by friends (in the real world) and people who can help me get my work published.