[trocadero]

Amazon (probably) makes about as much money from advertising as they do from their retail operations. When the margins for advertising is ~50% and retail is ~5% a little bit of ad revenue can go farther than a lot of retail revenue.

Of course that analysis ignores that the retail business is what allows Amazon to have an advertising business. But the GP is largely accurate. Amazon is most well known for their retail but it's not really what makes them the money. AWS is their cash cow and advertising is becoming their second.