New ask Hacker News story: Ask HN: Is it reasonable to ask a client to pay me royalties?

Ask HN: Is it reasonable to ask a client to pay me royalties?
2 by codingclaws | 13 comments on Hacker News.
As a freelancer, I built a trade show system 7 years ago and I was paid $10k for the planning and build. My client says he loves this system and he's used it at around 50 trade shows since I built it. I'm not sure how much he charges the trade show to use it. It has minimal bugs and requires little maintenance. Would it be fair if I got royalties or some of the profits every time he uses it?