A transit system has a different cost and is actually paid for by majority of users: the fact that few abuse it is not going to break it (as long as we keep it immoral to do so — note that there may be valid reasons to do it, when someone is in some sort of urgency and eg. ticketing machine is overcrowded or broken: it's not on us to judge even if we might be right 99% of the time).

Here, we are talking about things where it takes volunteer work to keep a thing you want going — I do not even want to imagine a world where a board game night is organized by a paid pro instead of the enthusiast, even if a status quo means that there is always an assymetry between hosts doing most work and guests never hosting themselves (maybe they do not have a big enough space though — they can still volunteer to help though).

I've realized this in high school and uni and started making conscious effort to sometimes do the social fabric things even when I did not feel like it, in order to continue benefiting from the social engagement.