I have learned that it makes sense to hire less good looking people, other things being roughly equal. Very attractive people - both men and women - are a distraction to a workforce of young, single people, and lots of flirting in the office can get toxic very quickly. Furthermore, if two people appear to be equally qualified for a job, you can bet your bottom dollar that the uglier one had to work harder to get there. To my knowlege, there is no law against discriminating on an attractiveness basis, as long as both men and women are treated equally.
