The title of this entry is how to make money by selling things that don't cost you anything. Most people will by now ask, "What exactly do you mean? Anything that you can get for free, has no value. You just can't sell it. It's just not possible." That, my friends, in an example of thinking inside the box. A person who thinks like that will never become wealthy. They are far too conventional in their thinking.
Think about it, you have many things that don't cost you anything. Pop singers make millions of dollars each year selling nothing but the voice they were born with. Think singing lessons for kids are a waste of time? Just think how many people in the world make money using their voice. And it doesn't have to be singing. Let's say you can't carry a tune. So what? There are many people who make six and even seven figure incomes who work in radio or even as public address system announcers. Remember, whatever they earn is pure profit. Unlike the guy selling socks who has to lay out all that cash for inventory, the one who sells his voice doesn't need to put any money down. When the sock guy has sold all his socks, he needs to buy more. When the guy who sells his voice is finished, he still has as much "inventory" as when he started.
When you start thinking this way, you will see there are lots of things you can do where you don't have to lay out a lot of money. But just remember, the most important and valuable part of the human body is the brain. That is where your best ideas for making money will come from. Take care of your brain, and it will always take care of you.