While I completely agree with you in principle, I must say that there's this "ballroom look" that the judges expect you to have. I watched a video where judges were interviewed as to what they look for, and every single one of them mentioned "grooming". I was a little suprised, since these were some of the top judges in the US, and I figured they'd look past that to something else. But no, grooming was practically the first thing that every one of them said.
I don't tan, but then I dance Standard.