RSS only goes two levels down in your website files. Your file structure on your site should be well organized, with all images on the root level folder named "images". Your RSS or Atom feed for a blog or site feeds should be set up on your home page or second level page designated for your blogroll. This is where you content should be consistent, relevant, interesting, informational, full of anchor text for SEO and images to keep it visually interesting.
If you set up your blogroll on a third or more level of files in your site, your feed will only pull the title of the pages/articles and not the content. RSS and Atom feeds are extremely helpful for those who use feed readers, those that use feed to tweet and share your content to social viral networks.
How do you know if a site has feed? Most of them have the RSS or Atom icons. But for those that may not, you can install the RSS Subscription Extension (by Google) for Chrome.
This handy tool helps you to also subscribe to any RSS you might find on the web. There is a plethora of tools to help you share your content on the web via your RSS feed. Facebook has them, Tweet-adder has them, Twitter has them, WordPress, and a ton more.
If you do web design professionally, and clean basic look is your direction, just make sure your RSS is set to pull the right content. You could potential 50% of your repeat followers without it.