Thanks for saying that. Still, it may not be how applicants see it. For instance my take from PG's "How to apply" (http://ycombinator.com/howtoapply.html) was that posting here could definitely be a plus — and that's one of the reasons why your role is so important. I know sama mentioned improving the quality of HN comments as part of the roadmap for YC to get to fund more women and I couldn't agree more.
You don't have to be active on HN to apply for YC. There's a technical requirement to have an account, just because YC's software systems were built that way, but there's definitely no requirement beyond that. I hope you'll participate, but if this has been your introduction to the "community" I can understand why you might not want to.