There are three badges that deal with promoting OGS. No one has yet managed to earn one of these badges. Inviting new people to OGS is the keyword, but the invite-button is - I think - yet to be implemented.
A bigger OGS community, with a regular infusion of new go players, who expand the diversity of our community is an ambitious project. It also has an interesting side effect; it will raise the number of people who donate to OGS. And more money means new features that can be implemented sooner, maybe hiring a second developer, etc.
Give us the tools and we can do the job.