As some of you may have found out by now, I am an "active replier". I know the feeling of not getting the desired feedback, I've been there, too, and it is nothing that only happens to newbies. I've been there in the past couple of months, too.
But keep in mind that a view - comment ratio of 10:1 is a good ratio!!!
And yes, I agree with PlasticSpanner on that people are interested in different things. There are absolute lovers of car photography who will also be able to comment on the light, angles, shiny-ness and whatnot of a car. I am not. So you will only very rarely find my reply in a car photo thread. Chris is no big fan of flower photography. So no PlasticSpanner-reply in many of my current "spring-threads". That is the way it is.
And you are in the process of trying to perfect your portrait photography skills, and I think you do get some replies in the Portrait Forum, don't you? But that is a specialised forum with not as much traffic ... but on the other hand you get replies from those who really know something about portrait photography there!
And I'd much rather only get three replies that comprise even maybe two sentences than 10 "awesome shot"-replies. I can do without those.