That sounds right, but I don't think that people would want that for game books. Comic books and other narratives are stories whose main value is in their initial consumption; repeated readings certainly do happen, but they're probably much rarer.
RPG books, on the other hand, aren't narratives. They're tools you use in running a game, and while I suspect that there are certainly some who want to re-read the old game books purely for the enjoyment of doing so, I think that many if not most of the people who want easy access to (high-quality reproductions of) the older materials want to use them in play.
And that means that all of the issues I mentioned previously are not inconsiderable.
Well if you can pay $15 or so for one month's access and then download ALL of the old PDFs in that time, that'd certainly be a deal.