I'm sure you're not doing anything wrong or breaking any rules. If you are, then I don't know about them either...lol. I think a lot of people, myself included, look but don't always post. I find I don't have time to post and I guess I've posted on those that catch my eye for some particular reason or other..maybe it contains some technique I'm particularly intersted in at the time. That's not saying that there's anything at all wrong with those I don't post on. Everyone's work is unique and lovely and I enjoy looking at all of them. I have posted only a few pictures of my work and I've had some that haven't attracted a lot of comments but that's just the way it goes..nothing to worry about.
Don't let it upset or worry you. Just keep creating and posting your work because I know everyone loves to see what we are all doing, whether we get many posts or not. Just keep enjoying your quilting..that's the important thing :)