A spin on 'secret santa' for those familiar with that sort of holiday gift giving:
How about a game where the players each submit an avatar build into a pool then must each blindly choose from that pool to play a standard game with?
There would need to be a 7th person to sort the builds, something as simple as shuffling then letting the players pick a number from 1 through 6, then assigning that build (via e-mail?) to said player or something similar. ie. The referee would tell the player what their build was based on what they'd pulled from the pool and the player would create that avatar to play in the match.
Since no one would be likely to submit a super build that they'd only have a 1 in 6 chance of getting back, moderate & weak builds would be prevalent. Just like the questionable gifts one tends to get through this gift giving method. To that I'd add four stipulations-- the build can have no more than 1 unused point, charisma must be at least 1, no assigning the 'master administrator' buff (I don't think its useless as many in the community do per se, but I agree its just too high in build points for what it represents) and public objective can't be "sloth" (penalizes diplomacy too much).
At the end of the game each player or the referee will reveal what build the players had started with.
Any interest out there in this sort of challenge?
