Which license cost $400 for the engine to make iOS games?
They have a weird structure where to have full featured "pro" version you have to buy the base engine for $1500, then you can buy various other licenses to port your code to other platforms, the basic android license is $400, the pro android is $1500, same for iOS, flash, then consoles cost a lot more if you can even get accepted as a developer by nintendo, sony, or xbox, and it costs a lot more for the game engine license to port to each of those.
But at the same time you can write your code in C#, and can port your game to a dozen platforms (if you have license to each) with a couple clicks, it outputs native apk files for android, native xcode for iOS, flash, xbox, ps3, windows8(coming soon), web browser, etc...
They give away a free version of the engine that outputs to PC, Mac, or web browser, you write the code once and can port it to whatever. The free version doesn't have a few things to entice you to buy the pro version, like dynamic shadows and post processing "polishing" effects, and removing/customizing the splash screen, but you can build a networked game with the free version and sell it commercially.
At the same time if you pay $4500 for the pro android, iOS, and base version, you can make however many games you want, where many of the others charge based on what you make. The most successful game I can think of made by 2 people with Unity is battleheart, omg pirates, and the other games made by a married couple making up the studio "mikamobile". I saw in an interview they've made 1.5 mil per year since 2009.
Edit:: If interested in the engine check out this free line of tutorials you can do with the free version of unity to make a standalone or web browser rpg game. Great for getting started and seeing the workflow for coding within the engine.
http://www.burgzergarcade.com/hack-slash-rpg-unity3d-game-engine-tutorial
The other thing for resources is the wiki site has tons of free code, the Unity asset store is accessible only through the engine but has lots of free models/textures and ones for sale(by individuals, you or I can sell assets there and Unity keeps 20% commission but handles payments and downloads). The free ones are great placeholders. You can use either blender or 3ds max to create models and import them into the engine, throw a few scripts on them and code the interactions you want. They also have free example games you can hack up and use commercially, or just use to see how an entire game is put together.
Here are some of the games I've made for mobiles, android OS using my kindle fire to test on:
View attachment 2389463