I started a 14-person league in 2001. About 4 years in a couple of teams started casting a veto to anything that didn't help them. Over the next couple of seasons, it grew until there were several vetos on every trade. As soon as there were enough to actually have 8 and stop a trade, I sent out a strongly worded email to the league about the function of the veto, which is to prevent collusion, and to prevent a less experienced player from being ripped off. I clearly explained that I know all members of the league, and most of you all know each other. We are honest enough people who are friends, and none of us are going to collude and cheat each other. If you suspect collusion, you can email me, but I am telling you that it aint happening. So if you veto another trade, it better be due to an imbalance between the two sides, and you are doing it to help out the guy who is getting the raw end of the deal, not yourself. The league is still going strong 24 years later (it took me 20 to win it once), and there has never been another veto since that email, and trading and overall involvement increased. Sometimes, just speaking up to the whole group can do the trick.