Yeah, remember Lucas wanted to open a museum dedicated to American "comic" art.... not sure if the museum is opened.... but he is the one who also bought the Crumb "Genesis"... and don't forget that the original "Fritz" also hit a record. So I would add Crumb to the list for sure.
The museum is currently under construction (with an eye on opening in 2025), and has been very active in acquiring pieces for its collection. (For posters collectors, one of the prominent purchases was the complete "Separate Cinema" archives of John Kisch
https://news.artnet.com/art-world/lucas-museum-acquires-separate-cinema-archive-1753629.)
Robert Crumb's Fritz the Cat original that sold for $700K, was the cover of the comic book. Although the poster image is an excellent copy, it isn't by Crumb (most likely Bakshi).
As for HA, I am not sure he can be used to assess marketprice... I heard/read so many things about HA that I think their auctions are biased (overwriters, candle bidding, self-bidding, etc.); they have cousin companies doing grading, so I am pretty sure they must have also insurance and overwriting companies to ensure that lot are sold and above estimation. Last, I think that some crypto/reddit guys are also tempering the market, some crypto "fan" groups are dedicated solely to this (we saw for "Dune").
Sales are sales - whether to Lucas, or crypto fan groups, and are documented. The fact that current management seems to shoddily neglect the poster division and can't be bothered to correct many obvious listing mistakes doesn't change their results, which are in line with other auction houses and private sales.