There is something to be said about song selection and song length that contributes (rightly or not) to a show's rating. BGCA 2 is a good example of a show with it's centerpiece being a new song (SYSF) with a great jam, and how that can move ratings over time. The "vintage" of SYSF (2nd performance ever) initially hurt this show's rating as most fans are jaded a-holes and don't want songs written after 1996 in their shows. Yet, because Phish fans are also fickle bastards, they soon realized that this version of SYSF (with a VERY long jam) does indeed kick ass, and should be rated higher than it was initially rated.