The key is traffic! Let me explain it to you, currently, the traffic is all in the hands of the advertising agencies, and there is a level of agents under the general agents. They control the resources of the advertising accounts, and essentially, they can control the life and death of your account. They are not short of traffic or clients, which means many of the advertising agencies you see in the ads are multi-level agents, and some might not even have a few accounts. Basically, what you get is fake traffic, or in other words, they scam you. Be cautious on your own, rather than dealing with them, it might be better to handle non-standard traffic yourself.