RSS for lazy people who can’t bother filtering their RSS reader is probably a very promising concept.

Well, yeah, who wants to sit and dick around with filters? I just want to know when "Part 3" is posted or whatever. I don't want to "subscribe" I don't need a feed of every thing they've ever written being filtered, just go fetch "is part 3 up yet".

I could sign up for e-mails too and just use mailbox filters. I bet something for "lazy" people who have better things to do than sit and dick around with their mailbox filters is a promising concept.

"wow part 2 was good, can't wait for part 3!" clicks Let Me Know.

vs

"Wow part 2 was good, let me subscribe to the RSS feed and go somewhere else and figure out a filter for part 3"

If I gotta go somewhere else, switch apps, whatever, I'm not interested, and it's not gonna happen. My brain has already moved on.