Install cost of ICE

By kaladost, in Android: Netrunner Rules Questions

Wow, been playing this game for almost a year now, watched a lot of videos on youtube of games, and I've just learned today that you have to pay to install ICE? How come I've never knew that before or realized it sooner from watching games? I don't recall ever seeing anyone pay to install ICE...I'm confused xD

Installation of the first piece of ICE on a server is free. However any subsequent ICE on the same server will cost you 1 additional credit: 2nd ICE costs 1, 3rd ICE costs 2 and so on. This does not affect the rez cost in any way