In my current game, I constantly get the message of new spies planted and even though being with +2000 in the green, I cannot produce spies fast enough to get rid of the enemy spies. Furthermore, four AI players can produce much more spies than I can, even if spend the same amount they do, summed up. This is because the spy costs rise with the number of spies you have trained, instead of the number of spies active, what I would understand.
Can you tell me, wether there is a cap on the rise of the spy recruitment costs?
Can someone tell me the exact formula for spy costs?
The way it is right now, I am unable to prevent others from gathering intel, sabotagin precursor mines and finally stealing tech from a certain point of the game on, because the costs are prohibitive.
P.S.: What is the logics behind linking the spy cost to the total number trained than to the number trained and still living/active?