@jmo - I'm saying that if I make you an offer in-game to cooperate with you in another game, I am not making an offer to cheat. As such, my offer is clearly invalid, and should be dismissed out of hand and rejected on the face of it, because I'm sure as hell not going to make an open offer to cheat in an easily documented manner. Thus, it is clear that my offer is a ruse (probably leading to your stab, at that...). Since it is illegal for me to make an offer to cheat, it is not a valid offer, and therefore is not breaking the rules...especially since it will not carry any weight outside the game, and therefore I can not follow through with my offer.
It's kind of like me saying "Give me your watch, and then I'll go rob that bank and pay you $1,000 later." Clearly this is a fraudulant offer. If you give me your watch and I walk away, I suggest you go buy a new watch with your own money, because you won't be getting any from me.