The Americans have a much much larger airsoft market than we do and their insurance companies are still fairly nacent on this topic, though becoming aware of it. I'm not sure what people are buying for games in Canada, but we can't be that much farther ahead if not plainly behind. Either way it is pretty clear that airsoft has its own distinct risks and types of injuries.
US discussion about this topic on ASR:
http://www.airsoftretreat.com/forums...topic=102921.0