Patriots Lil Pun used to start a thread in the Hangout and bump it a few times to advertise this to get more participants.
Just an idea. Maybe winner get's rep points from everyone that joined and lost? I mean no way to enforce it but just to put it out there.
I think the problem with that is that a lot of guys check out once they're eliminated. So maybe not a lot people would even know who won to reward them with rep. Wouldn't hurt to try though.
Make sure to check the spreadsheet to make sure I got your pick right. Let me know if I made a mistake. https://docs.google.com/spreadsheets/d/13bHKl90D1W34SXaUCNINnm_z1ivdVYq16xD8C_-vPVc/edit?usp=sharing I've added a sheet to show what % of players are picking what teams.