FYI. We can and do accept DDP files for replication via FTP at DiscMakers.
Do understand though that we are a big ship, not a speedboat, and sometimes it takes a while to change course. The reluctance to accept masters via upload was more of a workflow issue, and not so much a technical one with the plant. If we book 100 new jobs in a day, there has to be some way to track where all of those masters are, and since delivery on physical media was the norm for so long that is what our flow developed around here, a physical master traveling with the appropriate paperwork.
You or your client just need to inform the Product Specialist or Project Manager you're dealng with that you wish to upload your master(if they say we can't accept it that way just politely inform them that we certainly can and you received that information from me). Log in information will be generated and e-mailed to you so you can complete the upload.
In the very near future we will be making available an uploader that any client or studio can access to upload files for replication or mastering. I also spoke with a mastering engineer at AES who was interested in us providing a dedicated FTP share for studios in our Studio Partner program. We're exploring this as well, and this would certainly simplify the process of delivering masters to us for those studios that do a lot of business with us.