No. If you are in a league where an imbalanced trade could be so valuable to someone, there are better, objective systems you can install. My personal fav is the public counteroffer rule. That rule says that any trade must be publicly posted for some amount of time, and during that time, anyone may publicly post a counter offer. If no better deal shows up, then those owners are getting max value as determined by their market, so it's not lopsided. On the other hand, if a deal is truly lopsided, then a better offer will show up. At that point, they either break the deal off or insist on taking the original deal, which makes collusion obvious.