I do not think there is a need of a rule personally, however I also know not everyone plays the game with same level of... shall we say integrity.. as others do. Rules are for those that need guidance or direction on exactly how act or what is allowable in various situations.
It seemed like this is what was required for resolution to this debate.
If there is a better way I wait for enlightenment.
"A community is like a ship; everyone ought to be prepared to take the helm."
Henrik Ibsen