Earning extra income on the Internet is easier than you might think . After I started selling traditional craft items on the Internet last year , I have really been able to make bank doing something I love .   Is that right ? I hear all these horror stories of internet business crashing because there is not enough of a customer base yet . How can you be sure your idea will cash in ?   To run a successful internet business , it requires a little research and relatively small investment . You've got to have a good idea of some kind of product that is in demand or would be popular .   That's marketing research ... But what about getting started once you have an idea ? 