When you say "star", do you mean celebs such as Brooke Shields and Joey McIntyre (okay, not really a celeb, but hopefully you know what I mean), or do you mean those who have big names on Broadway such as Idina Menzel, Sutton Foster, and Bernadette Peters? If you mean the latter, although I cannot see those people in A Chorus Line, I don't think there is anything wrong with casting those who have a big name as long as they can handle the role well.
"We like to snark around here. Sometimes we actually talk about theater...but we try not to let that get in our way." - dramamama611