As far as we know, she is the MC which holds the longest reign in Utah, being a constant presence for more than half the life of the show. With the exceptions of people like Sal Piro in New York, it is also possible that she holds one of the longest stints in the country, perhaps even globally.
Despite her elevated image, she enjoys talking to people at the show, so don't be afraid of approaching her. However, do not say something like, "I came to the show in '95, I was really drunk, do you remember me?" She hardly remembers her name at most shows, and unless you got naked or were a complete asshole, she won't have a clue.
Susan was the first member of this cast, so I guess she must have slept with herself to get her part