I agree regarding the fact that they seem to be valued low. The appraiser that did mine said it appeared (based on his research on "solds") to be worth about double what a '54 chevy in the same condition would be.
Now, considering there were only something like 4,400 Kaisers made in 1954, and GM produced 1.3 MILLION Chevys in 1954. Stands to reason, the Kaiser is a rarity. Parts availability is not necessarily the reason for value. Hudson's, Studebakers and Desoto's of the same era are just as hard to find parts for.
I have the above stats from a January 1955 issue of Pop Mechanics where they reviewed the 1955 models. In it, they supplied several charts. One of them included the 1954 production numbers for all the companies. They also did a price "graph" comparing the prices. The Chevy - as expected - was down at the bottom of the list at around $1600-1800. I was surprised to see the Kaiser at around $2,600.00. Which put it firmly placed HIGHER than the Buick, and a little below the Chrysler Imperial. (Followed by Lincoln Continental and Cadillac.) It's clear the Kaiser was a "high end" car in it's era. Which again begs the question as to why the low value on them today.
BTW, my wife found mine for sale in a driveway about 20 miles north of me. First thing I did was look up on the internet and found Kanter. I could still get brake, suspension and engine parts. That was the majority of the battle for me. So... she bought it for me. (Seriously! As a Christmas Present.)