They prefer artists who get more wide spread appeal and collectors I guess. I'm not a Kiss or ACDC fan but those two would get the pub crowd (especially here in australia). Metallica is a head scratcher for me, I was never a fan of those but the people I know that used to like them consider them a joke band now?
I'd like to see more of a show theme, like woodstock or blues fest or something that combines a few different artists and covers a genre.