Fencing use to be a problem that prevented people from randomly stealing everything that wasn't nailed down because it was difficult for a fencer to move sell all sorts of shit. It's why pawn shops were so big in the sketchy neighborhoods as they were often acting as a fencing operation but there's a limit to what they could sell and how quickly they could move the product. Amazon and Ebay have pretty much eliminated this problem and now theft has become incredibly widespread.