you sit around waiting for the wheelies to arrive with a perfectly healthy, fit looking passenger!
In the words of the Bible - "Judge not, lest ye be judged!"
There are many people who outwardly don't look as though they need assistance, but do in reality. The immediate example that springs to mind is the person who has had recent open-heart surgery. (Maybe you'd prefer them to be paraded around the airport with their shirts open and the scars on view?)
Admittedly, there are some who "work the system" and use the wheelchair service because they can't be ar5ed to carry their cabin baggage (one female US Country and Western singer springs to mind who actually walked alongside the electric buggy carrying her bags!)
Thankfully, they are few and far between and we are usually delighted to offer assistance to those less able than ourselves.
I wonder how David Blunkett would react if we charged him for his assistance and made him buy a dog ticket for his companion?