Interesting that they don't mention luggage, which if we're talking about weight is a significant factor. For example, my wife weighs 105lbs but has been known

Interesting that they don't mention luggage, which if we're talking about weight is a significant factor. For example, my wife weighs 105lbs but has been known to bring her weight in luggage (not kidding). I weigh 240lbs and usually bring a laptop and a couple changes of clothes in a small carry-on. Only way to implement this (unimplementable in reality) idea would be to charge for the total weight being transported, passenger and luggage.