Depending on the category for figure, you need stones, because under those lights they shine like crazy. So if your standing next to a girl that's gone lots of stones, and her suit is popping on her, and have none she'll be taking the attention off of you.
Yes they are supposed to be looking at your physique, but there's more to it that that, as we all know. You need to be trying to get as much as the judges attention as you can.
At my last show, I was in the audience watching my friend compete, and when she stepped on stage, your couldn't help but look at her, her suit was shiny like crazy, and you would look at the other girls, but your attention would go back to her.