If you're selling videos, DVD, books, software, or CDs
Don't neglect Amazon.com either. They do a lot of business in used items and there is a convenient link right from the main listing to your used stuff. So if I'm looking to buy Hillary's new book (fat chance) I go on Amazon and see that it's thirty dollars or whatever. Then I see the link for the "used" items and see that I can buy yours for twenty bucks. WhatamIgonnado? Save ten bucks is what.
If you have furniture, clothes, crafts, collectibles, an interactive cookbook on CD, Amazon's not gonna work for you. Stick with Ebay or Half.
For me, bidding was fun for the first two years or so, but it gets old and takes some planning. Now if I want a book or CD, I go to Half. If I have time I'll check Amazon. I've bought probably 200 CDs in four years. Just had two or three 'problems.'
Word of warning. People that buy on Ebay are spoiled. They want their stuff FAST. If you go with Paypal, people are expecting delivery within a week. You can wind up with negative feedback from some Ebay newbie because they had to wait a whole two and a half weeks! Gee whiz. Peoples got no patience anymore.
SLM