The return on advertising spend is the foundation of any marketing campaign. The problem with traditional advertising strategies is that you cannot predict this metric other than statistically, and the chance of pouring money into a losing strategy is all too real. But there is a solution: Cost Per Action marketing, which is based on predefined user actions, such as sales. The point of this strategy is that you bear the expenses after yielding sales proceeds. This empowers CPA marketing with unprecedented flexibility and makes CPA campaigns some of the most scalable and rock-solid.