I would hope that attractiveness wouldn't matter. I would rather watch someone who is having fun with the game, interacting with the host and who is genial in victory or defeat, rather than worrying about whether someone would win a beauty contest.
One of the things I like about the daily Millionaire is that $25,000 is not a foregone conclusion, as opposed to the nighttime show, where if you employed your lifelines properly, you were guaranteed $125,000. It is interesting to watch people struggle with the questions, debate whether to use a lifeline, or which one.
I would gladly pay out $250,000 to a good player if it's good for the show, dullard or not.