A person who only goes to shows if they are on the guest list, and otherwise refuses to pay.
Or a person who badgers their friends to put them on the guest list, even if they can afford the cover.
"Are you gonna come out tonight?"
"Well, I don't really like his band, but I guess I'll go if I'm on the list."
"It's only 3 bucks - you're such a guest list slut!"