Just as a follow-up to the discussion, SurveyMonkey on MAP5 is working really well, with many more votes than previous contests. I'll see how MAP6 does.
Unless I do a survey about the survey I don't think one ever really knows the whys of social psychology - just keep testing until something seems to work!
Don't forget to join the Discord room - lots of plans being discussed on keeping the collective support going. And no bots!