I don't perceive a competition so much as an initiatory period.
In any social situation where one wishes to be accepted, some amount of conformity to suit the establishment is required. The thing is, here I couldn't tell you what it is. Post intelligently, politely, discuss with reason and respect, be honest, and you're good to go. That does not require much competition unless it be with one's own wits. Make enough good posts and people will start to notice and then make a point to read what you write.
So many people come and go, trolling or just being stupid that it's difficult to know who is going to stay around. Perhaps that's where the newbies feel excluded? You won't get as much attention until the regular posters think you're going to stay around and don't have some ulterior agenda.
I think this was exemplified by Swimming Lad who had something of a baptism by fire. While I'm sure it didn't hurt that he turned out to be far better looking than his fake pics, it was his character, admitting the fakes, apologizing, and staying, that won him notice and respect.