The concept of making money when you sleep has drawn a crowd to the pursuit of passive income. Theoretically, you put in some time and money in the start, then relax and let the money pour in when you focus on other things. This appears like a dream become a reality, but it's mostly only a dream. In today's workforce, relying on one income source is risky. Job protection is rarely guaranteed, and a little extra cash is useful always. By...