Long time lurker here. I see the last time this question was raised was 2014 and the answer was 'we like things how they are.' I imagine this is going to go over like a lead balloon then but I'll kick myself if I don't try. Why not use torrents or usenet? Right now all the DCM files are in one central place, someone has to pay for that bandwidth. For a user to access the collection he's got to click in individually to each and every file. It's a ton of work for the collection to be properly accessed on anything but a piecemeal basis. You're limiting how the collection can be accessed and ultimately limiting any preservation goals you have.
A torrent can decentralize the bandwidth costs. Every year or so I remember this place exists. I open some tabs, download a few copies and just give up because of the sheer tedium.
Arguments against - I can't think of many? Is it versioning- fear that an earlier scan will stay in circulation when a better copy is scanned? That should take care of itself in the long run. . and it could be avoided by having a baseline torrent file maintained centrally and seeded by members. I would get behind seeding that.
If the goal of this site is to preserve old comics, it can't do as good a job as letting the files be more available than they are.