It's worth asking where the people who spend the money are. For scouts, school groups, etc., the people making the buying decisions are old folks like me. Granted, that leads to issues of generational replacement of your customers, but that's a waaaay bigger conversation than this thread. On all of the government jobs I work on, the government retains copyright. I don't think they even need to pay royalties to use the design again. That said, boat design has different traditions and somewhat fewer lawyers than aerospace, particularly once the military-industrial complex is involved. I agree on movie/entertainment royalties, though.