"Buy, sell, and trade on the Internet, and become a millionaire overnight!" is an example of a Snob Appeal propaganda technique. A snob appeal is a technique wherein it involves an assertion that you must think and act in a certain way in order to attain a high social status brought by the action. In the given example, it means that if you join them and buy, sell, and trade in the internet, you will attain a high social status which is being a millionaire overnight.