I like the "don't get caught up in metrics" approach. I love what I do. Folks here, would call it a "hobby," because I don't get paid for it, but I guarantee that the folks I'm working with, don't see it that way. They are quite aware that I have done hundreds of thousands of dollars' worth of top-shelf, beyond-production-Quality work for them, for free. I do work, for free, that would have a lot of startup founders…
If so that sounds amazing!
If I may prod a bit, why not take a salary in your situation? Why work for free, especially when it's highly valued not only by others, but to you as well, since you know what you're giving, and work hard to maintain a high level of quality?