Only problem with more than 12 is its almost impossible to start 3 WR AND a TE AND a FLEX. Would have to go 1qb, 2rb, 2wr, 1flex, D, kicker. Lineups get to diluted past 12 teams. So I guess what I'm saying is my vote is 10 with the way the league rosters/lineups are set right now.
Someone is going to stumble on this thread after this weekend's games and go OH SH*T!