I'm with you... I completely understand... lots of factors to consider.
So let me create a hypothetical machine to maybe help zero things in:
Local pickup, working, mostly original, in "good" cosmetic condition.
You go there, you look at it and think "I'd like to own this." What would you think a completely hypothetical price range would be? $30,000 or $3? I'm sure a price is somewhere in the middle.
450 to 600 in my area of Connecticut.
It also matters on the person selling it. You never know what they are gonna come out with.