One more thought on the subject -
There's clearly some validity to the OP's idea, clearly you've got some people who don't post often who feel somewhat alienated.
That being said, certain people's voice do get heard more on Celticsblog but I don't think it has to do w/ the frequency of posts but the person behind it. Not just to self-deprecative, but I'm a relatively high-volume poster and I don't think that people pay that much more attention to what I have to say because of the 2 stars next to many - my knowledge of the NBA is certainly above average, but probably somewhere near the median for people on this site. People tend to pay a little more attention to the people who've earned it through great posts and great knowledge - your Roy Hobbs', Who's, IP's - just to name a few. That's a quality & quantity thing. You skim through and pay attention to what they have to say because you've read what they said, and while you don't neccessarily agree with them, you do respect their knowledge base & ability to post a good argument
People come here to talk Celtics, I assure you, if you bring up something interesting and/or worth debate people will be happy to oblige. If you're not getting responses to your posts it's not because you're new: it's either it's not that interesting or its because you summed things up really, really well and there's not much to discuss - I could start a thread right now that says 'Glen Davis is the worst' and it'll get a billion more replies then the best statistical analysis of our bench anyone's ever seen. And if it's the first half of that, just lie to yourself and say it was the second (that's no attack, I skimmed through your Jeff Green thread, Drake).
Keep posting, keep hustling, and keep workin dat papa'