I know I'm the forum moderator and don't play this would but this element of the game is on that i really enjoy. I have never spied, but I have 'run' many spies in my game play and find it an intriguing part of the game. But the main thing I find from the espionage game isn't as much the intel it yields but the ability to paralyse the enemy with paranoia, and then get the reports of the mayhem from my 'assets', getting the enemy to disintegrate. Often I didnt even have a spy in the enemy ranks, just managed to get a bit of intel through loose lips and then run with it, plant the seeds, water them and let the paranoia blossom.
When faced with a spy in the ranks of my tribe, I love the thrill of the hunt. Setting little traps, and ploys luring the spy to reveal themselves. But never take it personally, its all just a game. When I do find the spy I always argue against rimming them, I prefer to fill them with false information first