I'll use a personal example.
My daughter plays ringette. The ringette association, for their insurance purposes, requires that I buy her a CSA-approved helmet. They actually tell you that she's not allowed on the ice without a CSA-approved helmet. It is there to make sure they meet their insurance requirements, which require protective gear to be certified protective gear.
It's really a mark for the consumer who can go to Canadian Tire.... Presumably, a CSA-approved helmet might cost a bit more than one that has no certification, but in fact it will be most of them. In the case of helmets, no one sells a helmet that doesn't offer that certification, but that's exactly it. It's really to inform the consumer that you have a product that has met a certain standard for protection.