Yup. My wife works at Zenni in the manufacturing and product. I even tagged along twice to Danyang (Spectacle City). It's hard for another company to come in offering $7 glasses including lenses to the US when you don't have the supply chain optimized (incl. in-house manufacturing of certain parts) and the economies of scale and relationships with suppliers.

And then to deal with the sheer operations (talking like ten thousand plus frames per day).