Finally I'm sure out of thousands people 10 will subscribe but potentially that's pretty much it, that model wouldn't work unless you got something crucial. And to be honest this is just chit-chat. Yes I love to listen Paul Graham talk on stuff but none of the interviews are actually ground-breaking or great, it's just good time.
That's why I doubt if anyone would actually bother to subscribe.
Give it 3 months then I'm sure he'll change the model.