Heh, I definitely haven't been around long enough to have started the site! If the staff thinks someone will be good at it, they reach out and ask them. It's not a certain thing, you can be a great community member and be around for a long time and still not become one - there are lots of factors that play into it.
And - at the time of day (or rather, the middle of the night) that I am currently seeing this - it's been a good day! You?