I remember making a comment to my boss that every sales rep that comes in both male and female are always very good looking people. He said they only get hired if they are because then the person they are trying to sell their products to have someone nice to talk to and are less likely to brush them off.

Also, I think one of my fellow workers was kept around for her looks and people seemed to always approach her more then others. She was actually not really good at the job though.