Interesting point... I never make "in game" agreements, they are always "out of game". There is no history behind the agreements, no reasoning, nothing like that. What I mean is that I make agreements with the players, but big question is: how many people makes "in game" agreements as Kasnavada?
Funny thing is that anyone that makes an "in game" agreement seems to be more prone to treason. He does not risk anything, after the game finishes any backstab dissapears into oblivion...
And lets be realistic, who would make an "in game" NAP with Ryleh, they are alliens and mad....

or with Ermor...