For many years, Amazon was rewarded by the marketplace for losing money. The reason for this was a perception that Amazon would crush its competition. This perception was probably justified, given that Amazon's competitors were required to make money, while Amazon was able to lose money quarter after quarter without being punished by the market. This created an unlevel playing field as well as a self-fulfilling prophesy.
Having conquered consumer retail, Amazon now has its eyes set on B2B. Their goal is to be the Standard Oil of the internet. They want to be the main player in all content delivery. Ultimately, they will probably go after Google's search business as well.