The number of daily messages is not the problem, it could be five or even ten, yet the participants in the campaign could still make five shitposts. As long as the 20 required posts isn't the minimum for payout per day, then any one who feels it's within his capabilities to make the 20 posts without spamming nor post bursting can go ahead and do so, mind you you'll need a manager that'll be strict to adhere to the rules, "no spamming or burst posting"
The participants that make up the campaign are the representatives that the forum sees, you'll need a manager that'll select the very good posters, that way everywhere the signature is seen, it'll be complemented with a sensible and quality post above it.
Yahoo, Hamphuz, Dark star and some other top managers do and can do that effectively, you'll need to contact them if you wish, to know if they'll be interested, considering the furore this campaign has caused.