Everyone has moments when they think they've come up with a great new idea that will get them rich. Some of the richest inventors created some of the best products of all time, while others took common-sense ideas and turned them into something functional. Read on to learn how rich you would be if you could change places with these inventors, and understand what it's really like to be an entrepreneur. You might be surprised at how much, or how little, they earned from their inventions.