In reply to DubyaJamesDubya:
The "we" is any manufacturer.
The point I was trying to make (maybe my style/language wasn't obvious enough), was that if someone (especially a helmet manufacturer) made a large helmet that wasn't certified, then surely that would be lower risk for the climber than no helmet.
The fact that today's regulated society wouldn't allow the manufacturer to do this (because of perceived risk), is somewhat ironic.
I agree that in general rigorous testing and certification of safety equipment is a good thing.