In my days of travel....
The big fatties that exploit the wheelchair handlers are the ones who need fined. I have seen the most blatant and disgusting abuse of the system to; get pushed to the front of all lines, get pushed around by a servant, have servants carry their bags, get free upgrades, and most have terrible attitudes. Not all not all not all. But most I ever saw were simply being lazy and knew first class treatment would be given free.
And their travel companions.
Fatties should fly with the luggage down below.