I'd be up for it, but -- at this point -- we could only really rely on having Meltiger, Cupid Stunt, myself and yourself, although traffic on this forum does tend to pick-up when the season starts.
I'll be starting a fresh thread for each round of the AFL season and people's tips could just be placed in these, amidf general discussion of the rounds.
If we get a sufficient core group of people tipping each round we could sticky a thread devoted to the issue.
Did you want me to PM some of the other users who have frequented this forum and put the challenge to them? From a moderator perspective, the friendly competitive aspect of a tipping competition is a good way to ensure deeper accessing of the forum.