The secondary market for hot tubs is pretty close to zilch. Hot tubs are typically impulse buys.
Most often they are disposed of when a house is sold. The buyers of the hot tub are loath to admit their mistake. Buyers of the house don’t have the same sunk cost fallacy.
The seller of this hot tub clearly has a grossly inflated idea of its value if he thinks used wire is $6 a foot. He needs a reality check: Send him bids from a bunch of different email accounts, each offering him sub-$1,000 prices. Then, after he is conditioned that the value is minimal, offer him over $1,000 and see if he bites.
Or just keep an eye on craigslist. There will be realistic sellers coming along.