We technically belong to a group, but it's really nothing more than a newsletter. There are no costs, special statements to sign to be members, requirements of any kid. Come to what you want, run what you want. This way if a parent really wants to schedule a field trip or have their child participate in a program that isn't readily availible to small groups (like 2 kids and a mom) they can add it to the monthly newsletter and schedule it for a bunch of people. It's more about making resources and activities availible to the kids than anything. Honestly, we almost never attend anything with the group because we can't afford it or its at a bad time, but I like knowing what's going on in the area, and it has all kinds of stuff listed.
I also run a free net based cover school for homeschoolers. Most of our clients are at a "support" level, which means we're like a US-wide version of the other group. lol Since we're legally a school, we can offer homeschoolers access to programs that are either $$$ or not availible to them otherwise. We have other services, but that's the main draw.
As for the "support" part of homeschooling, I get that online if I need it. I don't often though, so it's not really a need to be filled you know? And the "social" aspect for the kids...well, most of ds's friends are from the neighborhood or scouts, even when we were part of a homeschool group. Dd could use a few more, but she isn't anymore outgoing with homeschooled kids than anyone else, so the groups didn't do any good there either. lol
Our local groups and co-ops fall into 3 catagories. 1) super conservative Christian school at home themed - where I've seen them publicly lambaste long time members for bringing scholastic materials because scholastic publishes Harry Potter and kids aren't allowed at the meetings. (pass, ty) 2) Unschooling groups that are aggressively anti-Christian and spend the entire meeting time blasting Christians for every perceived wrong in their lives to the point I was nervous that it might become physical if they found out I was one (pass, ty) 3) All inclusive groups where everyone is welcome...everyone with enough money to participate in their activities, that is...and they never have park days. The cheapest (weekly) activity any of them have is more than my low income family's food budget for the week. (pass, ty.) In conclusion, I suggest that homeschool groups are not always the best way to meet your needs.
Figure out what need you're trying to fill...then find something that will. It doesn't matter if you're part of a homeschool group.