"I am offended by your assumption that there is a universal measure of attractiveness"
Sorry, but welcome to the REAL world, in which people are regularly judged by attractive/unattractive _AND_ where "the beautiful people" are generally hired more often and with higher pay scales.
Otherwise, why ELSE would we dress nice and clean up our appearances (decent haircut, makeup for women, whatever) before a job interview? Come on, you KNOW it is TRUE...
To the sales staff, you ALSO know this is true, which is why SUCCESSFUL sales people dress as if they're going to a job interview, whenever they present the company products in front of potential customers.
It just IS, no matter how ANYONE *FEELS* about it. because, HUMAN NATURE.