Here's my take on membership / meetings.
I've been a member for 5 years and have attended all but maybe 3-4 meetings.
According to the CMAS Website there are approximately 120 or so members. There is a group of members that I have only ever seen at the Swap Meets and another group that I have never seen at a meeting - not sure if they sign up to receive the newsletters or what. Then there's the rest of the members - a group that comes to some or all of the meetings.
As for location, I live in Park Ridge which may be centrally located (depending on who you talk to and how you look at it). Schaumburg is convenient for me since it is only a mile or two off the highway and rarely has that highway been tied up. If I had to take side roads, the trip time would likely double. I'd have no problem going somewhere else, as long as it was highway accessible. Naperville, as has been suggested, is 45 minutes in good traffic. Getting into the city on side roads and highway (even on Saturdays) can sometimes be problematic. I'm sure I'd go to meetings that are more distant for me, but I'd consider the topic more before deciding whether or not to go.
Replotting our membership would be a great idea, but do you include those members that only come to swaps or those that don't come at all or those that sign up so they can get their whole family into the Shedd for $15? As has been mentioned, its hard to please everybody with a location.