I had a conversation with some of the SWx world organizers today,and this subject came up. They care, but they need help. When personal agenda selection starts up in a couple of weeks, they are going to try to make it clear that people ought to sign up so the organizers can get a head count on sessions before the show. Excepting hands-on sessions, signing up in advance doesn't guarantee you a seat - but it will help the organizers set up an appropriate number of seats in the room. So try to sign up (and in case other people don't, show up early for sessions so its some other poor bastard in the hall)