Serving 9.3M requests is impressive and if you are looking to build it into something more, have you tried getting some feedback from users? What is the reason they are using your service? I think in general, one of many ways the growth can be actualized is via feedback from those who is actually using the product/service.
Its a utility service that a lot of people are finding useful and has a lot of traction, but no way that I can see to monetize it. Not even sure I have a desire to try and monetize it, since it costs me almost nothing to run.
I would love to be able to build that resource into something more, but I'm not even sure where to start. It has a lot of usage and growth, but its not something I would remotely call a startup.
I made a short post a few hours ago about the current state: http://news.ycombinator.com/edit?id=4556711