I’ve often wondered this. It is possible just a few actually try to publish, but how many are a bit like me, and just design for fun? And how many of them are middle school or elementary kids! 🙂 … and how do we find them and reach out and include them?
I just found this one, thanks to Jim Galvin of The Tutoring Club: Powell. http://www.freezegophergames.com/
If you know of more, always feel free to comment or pop me a communique.