This is one of the main reasons why intermediaries can still negotiate high commissions of 10-20% and sites like Alibaba.com are so incredibly successful. Because to be honest even if producers market their products it is difficult and intermediaries market their services it is difficult. Shoppers also have difficulty finding the products they really want, especially considering they would like to purchase products made overseas to offer rarer items that come with better profit margins than domestically made items. Every final seller knows that the fewer intermediaries, the better and with fewer costs they can pass on the savings to their consumers while maintaining a nice advantage.