I think your idea is great, but my question is where would you have your meetings at? In order for all members to benefit from your club, the location would have to be one central location to justify travel expenses (mileage, time, accessibility, fuel, etc.) among its members.
I like to join fishing clubs and organizations for the pure benefit of the wealth of knowledge that can be distributed among the members. Meeting and talking to fellow fishermen are a great way to expand your knowledge. Seminars are a great idea as well.
Price for memberships would have to justified as well to pay for rental locations, food, drinks, etc. With the economy this day and age, people aren't going to dump alot of money into something that doesn't help and benefit them to the fullest extent.
Overall, I think the idea of your "grass roots" organization is a great one. I'm interested to see what exactly you come up with.