If something you read interests you, then you probably have an opinion or something of worth to add. Don't try and just post to get a reaction or get people to reply to what you say. Of course it is always nice if you are acknowledged for your contribution, but I can almost guarantee that if you really post what you feel about something, it will affect another person here, whether or not they post back.
There wouldn't be any intelligent discussion here if it went the way of many other internet boards with everyone just posting whatever they think will produce a positive response from the populace.
I think you got it though...you post more than I do.