It’s George Lucas’ first movie, of course there’s a market. Put From the creator of Star Wars on the cover and it will sell. They release far more obscure stuff through the archive because they don’t print more than needed.
How many people really want to watch this uncut without a guy and two robots riffing on it? 😉
It’s the typical non answer probably because George has the clout to keep the original buried. If TCM can’t show it, then Warner Bros. can’t release it either.