Want to Make Extra Money? Go Where the Cash is Already Flowing Whether you want to make an extra $100 a month or an extra $10,000, the high-level process is the same: Someone has to buy what you're selling. The money has to come from somewhere, right? (Hint: it comes from customers.) Sadly, there's an epidemic going around. The reason most entrepreneurs, wantpreneurs, and side hustlers fail is a lack of customers...