... which is pretty ordinary for a wheelset from a $4k bike
If you already have plenty of spares as you say and you wish to de-clutter, then eBay is the go, $0.99 no reserve and with plenty of good quality photos.
Good big clear photos of the actual item helps put buyers minds at ease, and they are prepared then to bid higher. Being prepared to ship nationally is also wise. Get a wheel box from your LBS. Buyer pays shipping of course, or you can go "free shipping" as a ploy to boost bidding.
I always have "$1 NR" in the title if I can fit it if I'm doing the 99c no reserve thing.
The above approach sees me sell things for consistently more than other ebayers who don't bother.
What if it only sells for $0.99 or cents in the dollar? Only happened once for a broken phone message machine that I sold for a bet (it sold at a (very small) profit after fees, so I won
), where I got my money back on handling charges.
It never has for popular items. Bike wheels are popular items.