I've, as of yet, not gotten into any of these co-ops (simply cause I don't yet understand how they work), but I just took the time to read through this entire thread and I must say, ATP has GOT to have one of the best communities I've ever come across online.
It impresses me greatly and makes me even more happy to have found this site.
Edit: to Hetty and Sandy...I know it ain't much, but I hope the acorns I'm about to share with the two of you brings some good to you for the good you have done here.