Having created a Club, having been President of that Club for 6years, and speaking to other Club Presidents an elected Officials in those Organizations, here is my take on your question:
There are people who join Clubs, just to Join Clubs. They don't want to socialize, they don't want to participate in any fashion; yet they want to say that they "Belong" to a Club. These people never vote.
There are also people who enjoy the social interaction, but won't get involved in "Club Politics". They show up at events, but when given the opportunity to participate in "Club Politics", most often they will abstain. These people seldom vote.
There are also people who enjoy the social interaction, and exerting some input as a Member. These people don't want a position, but participate more fully in the Club. They express their opinion on a host of subjects and actually show up at meetings (regardless of whether donuts are offered) and make their presence known. They show up at most events. These people vote with regularity.
Then lastly, there the 10% who do the balance of work. They are the backbone of the organization. They are the doers. They offer to participate, they plan events, they volunteer to run events (or make every single event). They enjoy being in the service of an organization. These people always vote.
So there you have it, and you can graph participation vs voting and get the same basic result.
Unless the Organization actively pursues a policy of making participation a requirement for being in the Club, you get numbers, but little participation in relation to that number.
-Ron