Have you thought about a free tier (non-OSS) that lets developers of small projects use the system for awhile while developing? Perhaps you could disable the CDN features, only have one data center, ... disable some other things that aren't required in development/testing but are required for production? As others have said I'm impressed by what you've done and want to do more, but I can't convince myself that I need to spend another $15/month until it's in production. And then when it's in production $15/month seems too cheap!