Since i saw this commercial i've reiterated to myself that being judged for your hobby isn't pleasent and i don't want to be a judgemental, generalising, superficial douche (not aimed at you Punch).
Like all things the coplaying community has it's better members and it's weaker ones but it does no harm and can entertain in various fashions. And you can get good simple costumes:
and astonishingly complicated ones.
I'd never take part in it though, not my thing, but then again neither is sewing an X-patch onto my jacket in referrrence to a throwaway scene in Scott Pilgrim (aimed at you Punch