It will be alot easier to help you out if you give a few examples.
But in general, if someone can justify why they made a certain trade, I dont see how anyone can complain. You and the other nine people need to bring it up to these two and see if they really can justify what they are doing.
Some people do collude, but others are just dumb.
"I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day."