Here's a few reasons why you should:
#1 They're free. Luv free stuff.
#2 They're simple to use. Just like email, new ones are in bold.
#3. You can leave stars and notes on stuff you'd like to come back and find easily.
(I'm sure there other sweet features even I don't know about. Can you think of one, do tell...)
Google (I use this one), MSN, Bing (whoever they are these days), Yahoo, Mozilla...all offer RSS readers and I'm pretty sure they are all free.
Save your fingers from typing out the full address and free up your list of Favorites. Start subscribing!