Players with 2 accounts?
Does anyone else suspect players of having fake accounts they play with, to enable them to win? I've seen what seems to be some obvious collusion between players.. actions that hurt one player to enable another, like trading 3 rocks and two wheat for a sheep. Or, always hitting the third player with the robber at every opportunity, even when that 3rd player is obviously losing, and another is far, far ahead.
Has anyone else noticed this kind of activity?