I think just like the movie industry there is room for the light fluffy purely entertainment musicals/plays as well as the deep meanifully artisitically driven musicals/plays. Without the light and fluffy (movies, musicals, plays, books, etc etc)that bring in the masses the artistic could not get produced.
"Judy Garland, Jimmy Dean, You tragedy Queen" ~ Taboo
"Watching a frat boy realize just what he put his d!ck in...ex's getting std's...schadenfruede" ~ Ave Q
"when dangers near, exploit their fear" ~ Reefer Madness the Musical