If you were selling on ebay and had to ship, you would get more for the front wheel alone than for the wheelset.
Single wheel ships in a "regular" box, (EDIT: EXCEPT IN CANADA, where that's oversized as well); wheelset ships in an "oversized", and the rear wheel is just not desireable.
So $20 for the rear wheel alone, and you don't have to do any work, take it. Freewheel, tool, etc, is worth something to others. He'd probably just toss 'em.
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