yeah - that's like PCBWay, et al. You can make boards yourself (even etch your own if you want to). But a lot of people opt. for the convenience of out-sourcing it.
3D printing is also fundamentally a small-run slow process, and can't match injection molded versions outputting 30000 pcs/month.
Market fragmentation means low-margin business plans won't survive very long. ymmv =3
Correction, it was only a $389.00 USD option before coupon code "$10OFF"