A great overview of the bandwidth issues surrouding RSS, which have cropped up recently: RSS bottlenecks are the early indicators of business models for the new architecture. Witness Slashdot, which constrains the number of RSS requests per hour. Alternatively, services that offer more frequent rates can charge for the privilege. A multi-tiered cost structure can offer variable rates based on the relationships between customers, suppliers, and partners along the supply chain. High-value customers might pay nothing for rich feeds, just as Amazon throws in shipping above a certain order amount.