OK seriously, just stop talking. You need to go look at some of the PDFs that were legally bought and see what quality they are. You are still oging on about crap under TSR era, when the TSR line was scanned by WotC and turned into PDF. PDF format as exists has MANY ways to clean those scans using simple macros for the worse ones, and AGAIN, the main core books for ANY edition were scanned and OCR'd meaning the text is black on white.A quick history of the digital printing landscape - Adobe wasn't always the king. A program called Quark used to reign supreme, but the software was counter-intuitive and a pain to use. Adobe came along and made InDesign, which is better in every aspect. The transition from Quark to PDF happened between 2000 & 2005. It's probably a good bet that WotC converted fairly early to PDF as their standard for digital archives. TSR...who knows. There are a lot of file formats that are not used and supported anymore, with the standardization that has happened and various software businesses that have died.
And who knows whether or not the TSR stuff was saved in good quality scans or not. Sometimes things happen and the only thing on file are the poor quality scans that were put on the net. We don't know. If it was, then transitioning it to POV is cheap. If it wasn't saved in a high quality scan (300 ppi+), then you have to pay someone to scan it. If the quality of the original scan is crap, you either have to rescan it or pay a lot of money to have someone clean up the scans (even then, some things are not salvagable). If the hard copies are of a good enough quality to scan it in without paying someone to go through and clean them up by removing pencil marks, stains, etc. - then it may be cost effective to POV these products.
That is a lot of "ifs."
So leave Quark to his bar on DS9, and find out about what you are talking about. You keep harking back to TSR and the early days, well some were done on manual and electric typewriters, and even Chainmail from 1973 existed from RPGNow as a PDF. (I think, would have to check the wayback machine to find out.)
WotC already did that work that you are talking about over a decade ago.
So you need to stop preaching your history of publishing lesson that matters none what-so-ever, and get back to the topic at hand, or at least PLEASE talk about what people are talking about.
If you disagree that the files exist in a form usable today that could be used for POD, then so be it. You are one of very few. The fact is the PDF files exist, they were made by WotC and were being sold, and the core books, that would be required to play the game, were OCR'd.
What more do you want?
Here is a 5 year old thread on ENWorld about the quality of the PDFs WotC made. http://www.enworld.org/forum/general-rpg-discussion/146763-rpgnow-pdf-quality-old-dnd-modules.html