In my opinion what it boils down to is the camaraderie.
If you place your helmet in the suggested position and you require help, most bikers will stop. Even in some cases, cagers.
Are you going to refuse help if the person does not suit your image.
You going to tell them to go away? "Sorry you do not fit my description of a biker"
If I see somebody in trouble I will not discriminate. Heart attacks included.
This is off-topic but I guess I was never introduced to this. What is the "suggested position" to indicate you require help?