I looked over the new system school website and don't quite get it. It looks like if you join you're just homeschooling your children. There isn't a building or anything that you send them to. It looks like you send $125 bucks in but I can't see what you get back. Perhaps a list of required textbooks? It seems really lame to me. Parents could go to the home schooling legal defense fund website themselves and get as much information without paying nss a dime.
Listener I had noticed the same thing... there was something like this when I was a teenager I was homeschooled and there was a group that organized field trips for homeschooled JWs. I think my mom paid dues to be a part of that too.