Wow, that's a great idea, johnarryn... some sort of spy network that applies a percentage to the accuracy of graphs or something. Could even be implemented on a nation basis, thus easy to slap into the code. But potentially hugely unbalancing. Hey, even another thing to spend pretender points on. *head explosion* Another thing for the devs to perhaps look into.
I'm ambivalent about graphs in games - actually prefer them off. But when they're on, you gotta use 'em. Which, unfortunately, makes it tough for those who are clearly winning.