Remember kids... always wear a helmet. (The almighty bikeradar helmet thread)

... Those hipsters think they look the bollocks on their arropoked lo-pros when in fact everyone else thinks they look like complete cocks. They would never wear a helmet for no other reason than ego.

...they are not particularly expensive, uncomfortable or unsightly. They are not compulsory so you can make your own decision to wear one or not, but make that an informed decision based on your safety, not what you think you will look like.

... I see no practical reasons not to.

+1