This is one of the best things about HN. The sheer number of times someone has posted a link and the author or someone significant to the project deep within some megacorp makes a green account and starts answering questions that you never thought would get answered. Some of the most golden replies come from greenies.
Yes, and we've always gone out of our way to protect those. It's perhaps the thing I hate the most about our software that sometimes it kills such posts.