Leant - Richmond apparently has 100,000 members but only 40,000 can rock up and watch a Saturday arvo home game at the G. What the???? I have learnt that they certainly aren't the biggest club as they claim.
Not sure you've thought through memberships. They aren't all 11 game members, so they don't all have access to all games.
Add in illness, weather, family or work commitments, and you'll find the proportion of attendees is about the same for every club.