EBay is worth it for anything that is easy to ship (read: small) and has decent value. Particularly if that thing is fairly niche so you need a wider net to catch people. Do note there are effectively zero seller protections on EBay, it’s not hard for a buyer to scam you.

For anything that is hard to ship, Cragislist or FB Marketplace is a much better stop. And, since you sell with cash, the deal is complete once you part.