I like the simplicity, well done for getting this up and running!

Please be more open about the pricing though. When the service costs are not upfront and are buried in the FAQs, I lose trust in the service.

Every real customer of yours will want to know what it costs. Have a simple pricing page at the very least, and link to it from the standard 'how does this work?' and other places. Just saying that you can pay $2 to keep your server running longer is not good enough.