I wrote an article about the 5200 homebrew scene and chose the top 10 homebrew games (it still hasn't been printed) and it was a tough one to write. The main reason we don't see a lot of homebrew releases, I believe, is that there are a lot of conversions being made from the XL/XE systems. Since there are so many XL/XE games, the focus has mainly been in converting those games and not in releasing homebrews. Of course, that's just my impression. I may be wrong. If you go to Good Deal Games, you'll find a ton of conversions for the system released in cart. Even with this, there are certain games that have not seen release, like Mr. Do! The XL version is superb and could easily be converted to the 5200 but, for some reason, it hasn't been.