It was not because of the pay plan. It was not because of the products. They just trusted their sponsor, so they joined him. It makes no sense to convert them away from that advantage. Network Marketing is not sales.
Trust building is the opposite of sales.
It's building a relationship. Most Networkers have a Target Market they approach with their opportunity. That Target is other Networkers. Networkers won't ask if your opportunity is a pyramid. They are already beyond that.