I've been trying to figure out how it might work.
400Gb is a lot to host and, moreover, a lot to move across the wire.
Folks are going to want local copies (I know I do), the additional cost of which will not be insignificant (e.g. 100DVDRs, hard drive).
We could choose a "lead" person, who we would pay and who would take care of the transaction and receive the files. This person should be someone most of us trust and be located in the USA (I guess I'm out on both counts!). That person would agree to make and ship 2 copies (at receiver's prepaid expense!) to other "members", who would agree to the same thing.
Not sure about a hosting option, although a closed FTP site (or 2 or 3) might be easiest (once you move the files).
Anybody ?
Cheers