Yehudayona, once Rav Moshe paskened that something was not considered chametz because a dog would not eat it. Someone threw a piece to his dog which proceeded to eat it. Rav Moshe said “Crazy dog”. Rav Soloveichik once was confronted by a similar situation and asked whom his interlocutor would believe, the dog or him.
However, it is obviously correct that the hechshers are given because they enhance competitiveness. Similarly, hechshers regarding treatment of employees are not generally given (although there is an organization in Israel that has tried this) as they do not enhance competitiveness.