Agreed - USH models have taken a major hit from the days of $4000 cab forwards and AC-9s. But eBay routinely maximizes prices. Broken ladders are not a great selling point - be better to fix them before selling.
My Max Gray MT-4 cost $239 in 1961. It went all the way to $1200 in value, and is now around $800. It is roughly equivalent to the NKP Berk.