Cheapo airlines require that at the point of embarkation that you demonstrate your cabin baggage fits within a pre-defined set of parameters, being size and weight. Perhaps a similar regime should be introduced for passengers, as well as their baggage. And before anyone pipes up with 'that's discrimination' - no it isn't. If you want to contract the services of one of these people/luggage couriers you should pay reasonable costs for being transported. I would hardly expect the Post Office to deliver a parcel for the same price as a letter!