You've got to remember, you are buying from and selling to other individuals. Ebay and RCU are justs forums that allow you to do that easily. Ebay has been around for years, and it's the first online "market place" that most people will go to buy used stuff from other individuals (or find low prices on new stuff). RCU has a much more focused & limited set of buyers and sellers, which has advantages and disadvantages. I believe Ebay has a pretty good safeguards and rating systems in place to protect both buyers and sellers.