I actually had to look up what an RSS reader is.....
Well. Put bluntly, I would probably never use one and if I were to use one, I would not use one for a forum. Unless I am missing something in how an RSS reader works, that just sounds like a really, really bad idea.
There's only a few things here I want to read about and if I stumble across a post with an intriguing title, I'll click it. No way I would ever want a summary of every new post here every day.
Even still, with an RSS reader, you can read the part about the new, unlocked cellphones for sale and say, hmmm, prolly don't want to read this one, unless you're in the market for a new, unlocked cellphone.