the chances of getting the III animation on film were astronomically low. I don’t even know how that happened.
Hi, I'm not FemboyFilms, but I am the owner of the Super 8 print they scanned thanks to a lucky find (still $$$ but 1/3 the cost of the only other one I'd seen listed) on Yahoo! Auctions a while back.
The chances of getting the III animation on film were much higher than IV. The Daicon III convention ended up 2 million yen in debt. The only real asset they had was the animation, so they formed the "Daicon III Deficit Rescue Committee" and sold copies of the animation on 8mm reels and home video formats along with some other goodies.
This was mentioned in "The Notenki Memoirs." Unfortunately I've never seen anything to say that they ever sold 8mm copies of Daicon IV. That may just be a 1983 vs 1981 thing - two more years of home video rapidly eclipsing home movies - but it's extremely unfortunate.