The short answer is it doesn't make money right now, but there are possible alternatives for the future like adding a job board. Hosting is so insanely cheap that the cost of running Hoverboard is incredibly small. And thanks for the UI comment!
To be honest, I wish I could pay for a service like this. One that would respect my privacy. Given the needs of freelancers and consultants, I reason $50 a year is a good price. You have to understand what your product is: a lead generation tool. Those are always worth the money.