I would speculate it was either an ego sale (auction fever - not going to let someone beat me on a bid), ultra low mile car, or just a clueless buyer. Looking at ads anywhere - you can buy a <10k mi Karma all day at or well below what they paid for the auction car and that is buying a car at the sellers full asking list prices. Don't let this price point get you too excited in overall valuation just like not letting a Manheim low price get you depressed.
IRT where the car came from - I don't see that as much of a factor. The Karma is a specialty car and they typically are not a daily driver for most owners and wouldn't see a drop of rain or snow regardless of where they're located. Do you hear a Ferrari buyer being worried about if a Ferrari is from the Northeast? We are not talking a Ford F-150 daily driver that has been slogging it out on Michigan salted roads for a few winters - totally different vehicle class and factors of consideration.
I was under the impression that the Karma is built entirely from Aluminium, which does oxidate, but does not rust as steel does. Am I wrong about this?May be true for the most part but here in California I have seen rusty undercarriage Karma's that have spent their whole life close to the ocean rather than a few miles inland. These cars exhibit signs of rust if they are anywhere close to salt regardless of where they are used. One of the main manufacturing defects is corrosion. Keep away from salt air and humidity of ocean as well as salted roads.