I would say (assuming) that each club gets a pool of tickets and every time a Richmond or port member buys a ticket it is registered and is taken from that respective pool. Port would get a lot more tickets to sell. Being the home team they always got more tickets to sell I thought.
Again it should be 80% of the tickets should go to port and 20% to Richmond and the other public
No that's not how it works. Tickets go on sale at 9am Monday to members of both clubs.