When I was young and climbing in the 90's I would never have worn a helmet sport climbing, it was not cool nor functional. Now twenty years later I probably will never climb anything without a helmet. Perhaps its age and wisdom..
But falling at any point and getting the rope behind your leg and flipping upside down can easily ruin your happiness. So I wear this all the time now, well not around town but all the time climbing.
Its light, functional and may not last for ever but since it is protecting my most important asset than I don't mind getting a new one every few years to ensure that I have the best protection for my nogging.