This method involves filling in a few blank advertising text-boxes for various marketing companies. You get paid a commission if the company is able to sell their products through the ad you just typed in for them. This is far more lucrative than doing paid surveys, but does require a little startup capital of say, $25 dollars in addition to the memebership fee to join these companies.
Legitimate companies will tell you what to input into the text-boxes and do all the marketing for you. These companies actually find it cheaper to pay someone on a commission basis to do some of the grunt work for them, while they can concentrate on marketing and creating sales-ads (which is what these companies tell you to input into the ad text-boxes).
The scam companies want you to do all the work, come up with the marketing, pay for everything, including marketing costs, and then when the sales are made, they do not pay you your commission.