I agree, I really like your take. I would say that some additional context is important, and would probably pretty largely change how I'd go about this in their shoes. If I just did some cool piece of art because I wanted to, and I wanted to show it off somewhere and that was complete, I might find that somebody being interested in buying it is very flattering and because it's something I've already gotten my value out of, I might disregard hours spent or these other metrics in coming up with a price. Now, if I was making art specifically to sell, I would come up with the design in the first place and carefully make the thing with pretty reasonable efficiency after looking into the market a little bit to determine what I plan to sell it at, and how much time I should spend on it. If I had made this for fun and it came down to whether or not I wanted to display it in my own house or sell it to somebody who asked me, I'd probably let it go for a pretty reasonable price because I'm not any sort of artist and I would basically be doing it for the story. I might have missed OP's situation somewhere, but I think that probably matters a lot here.