I don't think you understand him well Kire. (it could always be me who misunderstood off course
What he's proposing has nothing to do with keeping an eye on your map. To give an example of his idea:
I send a saboteur today to the city of an enemy. When I log on the next day, I see that my saboteur has returned successfully (although he might have been bribed to say he was successful while he failed). When I want to attack that enemy now, I will have an advantage because his walls were already weakened before the battle has started.
I like the idea that he can be bribed to tell he succeeded while he actually did nothing.