I highly recommend you at least have one funnel in place to generate customers in your business, whether it's a service or product-based business, because it will help keep your company safe. It will help keep you safe from the FTC coming in and saying, “Look, you just have a big down line full of people that only buy the product themselves. You don't have real customers. Thus you're not a real business.”
One of the best skincare products in and outside of MLM, no doubt. They were founded by a couple dermatologists, and they used to be an upscale department store brand before entering the world of network marketing. Rodan and Fields created Proactiv, which ended up being one of the most famous skincare products of all time (and a hero-in-a-bottle for every middle schooler who’s ever been called pizza-face). Just this one product line is nearing $1 billion in annual sales.