As for the original question, if what you write garners interest, you will get response. (see this thread)
As for volume poster (me being the 2nd biggest volume at this point) I have dropped many posts that never get response. I have dropped many post that garnered one response. I have dropped posts that have garnered pages.
But in many ways, I get responded to more often is because I have more out there to respond to. I am averaging just under 15 posts a day. There is a better chance I will be responded to.
Also, the order of posts. If everyone is responding to an earlier post, they might not have gotten to yours yet. Or, they may just be waiting for someone else to respond to what others are say.
But at the same time, it would not surprise me if posters sometimes find themselves drawn to the familiar posters. The poster they are used to reading. The ones you know.
So, this is not a conspiracy to ignore new or low post count posters.