Helicomatic is a big turn off. In my experience, the best way to get value out of spare wheels is to put them on a bike, build up a frameset, and sell the finished product. Or use them to upgrade a bike that originally came with steel rims, and sell the finished bike. Or use them as trade bait, trade them for something you need.

If you have a set to sell, I would not sell the individual wheel, as then the front wheel becomes an "orphan" with even less value.

Freewheel and skewer are probably worth that $20 price tag.