Memberships are just a dick measuring contest anyway. It was the NRL's way of letting souffs feel relevant pre 2014.
If they want a true indicator of what the memberships are then it should be revenue from memberships. A body count is bullshit when a single ticket or supporter pack member is counted as 1 along with someone holding a full season ticketed membership.
Average membership revenue per member for the Rabbitohs in 2020 was $123 ($3.7m in total) down from $133 in 2019 ($4.0m in total).
Be interested to see how all the other clubs top this based on their financial reports. Eels, Storm and Broncos would be up there for sure.