I think you have spotted this for yourself quite accurately-- overwork. It would be a shame to burn out on something you love so much. I hope you will find good people to help spread the load around a little more, because it's starting to sound like you versus THEM-- and the list of THEM sounds long. What might help would be to focus firmly on what you fairly think each of these folks does best-- and then love that out from them. It sounds like you are providing a really good thing-- if you focus on what you love about it and get help with the rest, I bet you can keep providing it for a long time to come and have even more fun with it. And-- what would it take for it to pay its own way? (Not what do people say it will take, what do YOU think could happen?)

GO FOR IT!

~Susan