Miller's is a professional lab that caters to portrait and wedding photographers. Protecting their pricing is a service to the pros, as is their requirement that you sign up. As I said, they are top notch and very focused on quality and customer service. Atlanta no longer has any C41 labs so I was delighted to discover that one of my favorite suppliers still handled it.
Fair enough, but they did let me in with minimum proof. I'm still starting out, so I don't have a big online presence. I'll definitely try them out.