eBay proves the free market works and "people are basically good"

I’ve been using ebay to buy and sell my possessions for about 5 years. I’ve had over 300 transactions. I’ve made some decent cash selling everything from computer parts, to a lcd monitor, to a pair of my jeans. I’ve also bought some things for cheaper then you can get anywhere else. The only time I’ve had a legitimate issue, was when it involved, you guessed it, the post office.