Yeah, that's unfortunately not something we can really handle other than decreeing "Doing this chore entails doing X and it doesn't count if you don't do X." Enforcing the system isn't solved by the system itself.
a method of communicating between people who like each other and have outside-the-market reasons to cooperate
Good way to describe it.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.