Thanks for your reply ralph. This has really inspired me. It's funny what gets you going. I had a revelation of sorts in the early 2000s. I was a web developer back then just starting my business, it was doing really well. Then I was offered a job as an assistant to a famous person who toured. She had a designer design t-shirts she would sell after performances. Since I was the assistant everything went through me. The designer charged her $60hr to make the design. Took him about 6 hrs = $360. He probably thought "wow, I'm getting $60hr to do this easy design.
When we would tour she would sell the shirts after each show and depending on the size of the audience (300-1000) people, she would make $1000-$4000 PER NIGHT on shirt sales alone. I remember thinking at that time that there is something really wrong with hrly billing! Fast forward, I saw her recently on tour, she is STILL selling those shirts. That is why some of us are in the 1% and some of us are in the 99%.
But you are right, the problem is determining the value.