The cartridges are actually kinda a funny story to themselves if memory serves. Nintendo required that they manufacturer the cartridges themselves (and they had minimum orders), which was separate from the licensing side of things. Then you had disk based game systems come along early 90s which were a couple of bucks to manufacturer (on avg). I remember reading about wild deltas depending on your company size & how much you shipped on what you could expect your take to be on a title, which also makes it hard to compare.
