I consider pinball an investment. While it is not making me as much money as my other passive investments, it is a hell of a lot more fun. And I am not talking about routing games. I used to do that but currently just have games in my basement. But the maintenance of value for both pinball machines and arcade games is pretty good. But to answer your actual question, I have real estate and stock market holdings that give me passive income equaling about $27k per month on top of my salary as a physician. I am looking to make that about $50k and then I can retire.