He was only illustrating how thick the Valley is with that kind of people, not claiming they'll come up and say "Hi" if they don't know you. I don't see how being Paul Graham makes it any more likely that people associated with startups will be at Oren's Hummus or in front of some random yogurt joint when you arrive (unless we're postulating some PGPS technology that tells entrepreneurs where they can meet Paul at any given time).