For the dual layer discs I would need to keep enough hard drive space for the raw image and then do the encode and burn after the post office run. During summer break I would try to do a month or two of the 8 DVD plan, but that was too stressful.
I also remember trying a few small online businesses that did the same thing but with more interesting curated DVD collections. I don’t think any of them lasted long. Heck, some of those could have been a single person mailing out and restocking discs.