It's not about making a good impression to pg and his friends.. They're smart developers, and I'm sure they aren't going to turn down a team because they didn't participate in news.yc..
What YC does give is A) A user-driven techcrunch-style site, where people can discuss the nuts and bolts
B) Focus- The conversation on sites like Digg or even reddit can devolve pretty far, and people end up spamming the site. News.YC has avoided that in part, because their answers ARE "graded"
C) A chance to discuss things with other like-minded people. Out team is going to be applying to YC this summer, but even if we're not accepted, News.YC will be a good source of discussion with other people who are thinking along the same line.. Even if we had no relation to YC, I'd read/write here, if only so that I could see people's replies.
I don't write posts to look smart, but when I do write something, I am somewhat more careful than usual, yes.
I just think that a lot of people would think twice about voting if that were to be considered in their YC application.