Mobile games? Maybe its a growing industry, but it will face some restrictions. Like mobile devices performance. Besides, I have a powerful cell phone, but I don't play many games. I download only free ones.
But what I really put my money in - games on pc and ps4. Its more profitable industry, I think.
The mobile industry is really booming, even free games generate revenue through advertisements or in game purchases. PC industry is still quite big but I believe the market cap of mobile apps is far bigger.
It depends on the way how you are at your managing skills and your analyzing skills. The process to accomplish a successful ICO includes many tasks and if you are confident enough about the value of your coin then you will be able to calculate the possible earning from the ICO with more accuracy. If the project is in need in the real world then it will be well established then the token will have real value and will be sold rapidly. So after finding a real project you will be able to calculate the cost and earnings from the ICO.
You won't be able to calculate it accurately. A coins success is determined by public involvement and whether or not it's hyped and how much news coverage is gets. You can make an educated guess on how much you are going to earn but certainly not pin point accuracy.