The concept itself is pure genius. A place where buyers and sellers from around the globe can meet and do business without any physical contact between the two parties. Is it any wonder that eBay has grown as big as it has? And then they were smart enough to start PayPal to give all these buyers and sellers a means of exchanging money. Brilliant.
Of course eBay and PayPal have flaws but it is the best of it's kind right now.
Instead of throwing out old PDA's, Cellphones, Camera's, Camcorders, Computer Parts and Laptops we can make a little money back from them and they continue to be useful to someone.