Can't this be said about everything in the game?????
Capping MISSILES will make them more dynamic. Currently you either have a lot of MISSLES, or hardly any, and when someone destroys your MISSLES, you lost a lot of progress. Theses changes will make planes more dynamic, and even the playing field for nations of all sizes.
Change SPIES to any military unit of the game and what you say is the exact same thing.
or.....
Capping CITIES will make them more dynamic. Currently you either have a lot of CITIES, or hardly any, and when someone destroys your CITIES, you lost a lot of progress. Theses changes will make CITIES more dynamic, and even the playing field for nations of all sizes.
A 2 per day spy build makes people come to a game daily to play. DAILY is the key to any game. Getting people to come back gets them more involved. Now, with 50 spies, I don't have to log in and do anything but once a week or so; unless I get an email that I was attacked or see actions on my Alliances forum, outside the game itself. You have eliminated the one reward players get for coming to the game daily.
If you wanted to make it more "even" and fair, just make Spies like Cities and Infra. The city costs go up for each city and infra costs go up as you buy more. As you get more spies, the cost to hire and maintain goes up exponentially. Easy. Simple.