And the most important thing is that you’ve built a solid foundation to improve upon. Most people can’t ship as much as you have, and most don’t have the foresight to write a blog post about it.
I’ve started to notice similar things on the economics of themes and plugins on Themeforest. Unless you’re a top selling theme/plugin the revenues don’t often provide enough to encourage updates. I’ve had a few themes I bought go not-updated for years, so I have to switch to more popular and robust themes that I know will be supported.
Does anyone know of any other hubs for content creation that don’t keep such a steep % of $?
I think http://ui8.net may be a viable option for now if we're talking about design/ui-kits/templates/etc. However, I'm not sure how big their customer base is.