Good article!
I totally agree with choosing your networking groups carefully before joining. I joined a group where every meeting was consistently dominated by one individual who liked to hear himself talk. The group coordinator tried to steer the conversation to include the other business owners but that typically only lasted for a very short period of time before it was back to the one individual and his business. Of course, this same individual never helped promote the group or refer the other business owners, he just wanted to promote his own business.
I am no longer a member of this group because it was simply a waste of my time.