Yes! Artist co-ops sound awesome! There's a few in my city, as well as various societies, guilds, and clubs. I haven't joined any, but I feel I need to just for the benefit of sharing experience and knowledge. Though, lately I've been thinking of turning to Hubski for that. There's a ton of really creative people on here, you included of course.
As for selling stuff, I've really, really fallen in love with book binding. I think I made about forty or fifty journals last year just for the joy of making something. For a while I was thinking about starting a business so I could sell them, but eventually came to the conclusion that commodifying them and trying to build a business around them would rob me of that joy. Now I just make them for the pure pleasure of it and I give them as gifts to friends and family. Funny enough, some of the people I gave my first books to I turned around and later gave them some of my more recent books, just because my first few were so flawed I honestly felt bad about them being gifts.