I've been debating this with myself for a few days (since Communities started). There's already a ton of "Google+ Help" communities out there so (a) is another one really needed? and (b) is it really necessary to add another layer to what we already do (Website, Google+ Page).
I think the answer to both questions is yes and here's why:
There's lots of communities, but they're not my Community
I've seen (and joined) lots of great Google+ Communities, but none of them so far are really 100% what I'm looking for. I'll dive into them, share posts, +1 and comment, but I still need a place to call my own. The G+ Resource is a necessary place to extend what we already do on our Website and Page.
You ask a question in our Community and you'll get an answer from us. Guaranteed.
Why create a Community when you already have a Page and/or Profile?
It adds another dimension. I like the idea of creating a (managed) space where people can come and ask questions and get answers. The main Google+ stream isn't always the best place for that.
So where is this Community?
Right here. Go check it out and I'll see you on the other side.