answer:What they don’t tell you about is the risk. For example, you may purchase the tax lien on a piece of property, but you’re not purchasing the property unless it’s in foreclosure. And in forclosure, you’re going to be in line with other creditors for the property. I know one person that makes money on eBay. She sells American junk food to customers in Europe. EBay has business opportunities you can buy into and sell their goods, however, there are thousands of other people on eBay also selling the same products. Flipping houses only works if you have the money and time to put into fixing up property yourself. Any time you have to hire contractors to do the work for you, you are eating into profits. Whatever the idea is, there has to be a market for the good or service. In the case of real estate, you have to have enough liquidity to either hold the property or cover the expenses. If there was truly money to be made it it, they wouldn’t marketing a “system” for others to do it; that’s where the real money lies, in selling a “get rich quick” scheme to others. I do know several people that have created niche income streams, but it’s related to things that they know. One is a runner, and after contemplating the paradox of choice, has an online sock business. You don’t need to try on socks, the cost of the item is low, socks aren’t returnable, buying socks online is a convenience. He’s funding his children’s college education by the sock business.