Nice work. Does it support connecting to a Replica Set? Have you thought about turning this into a hosted solution?
I thought about making it a hosted service, but I wanted to release a minimal version and see what the feedback is, so I decided to make it open source instead of putting a credit card form on the page.
One of the biggest problems I have with open source is finding help fixing problems and just getting support in general. I'm happy to pay $$$ for software as a service, key word "service". Open source is a value add to SaaS, not the other way around!
In addition, there are TONS of people making money off of open source. Hell, that's the business model of almost every web hosting service in the world. No reason you couldn't.