Every now and again, I forget that rule, and whenever I do, the universe kicks me hard and reminds me. I don't know that it's an issue for anybody but me, it's true that nothing I did where the only reason for doing it was the money was ever worth it. Usually I didn't wind up getting the money, either. The things I did because I was excited, and wanted to see them exist in reality have never let me down, and I've never regretted the time I spent on any of them.