If we start asking about the passenger's weight, why don't we start giving the passengers the visibility into the pilot's capabilities. We could provide to the passengers a score from 1 to 100 on how competent the pilot was on their last checkride. I know I would like to know how much the person I was trusting with my life knew about flying. I would actually like to know that more than how much the person next to me weighed.
Hmmmm. Yeah...let's put everyone on a scale!