had to post ....
The "facts" you're going on are likley wrong. How busy was the rest of the car park ? What time and day was this at ? Not too hard to realise that disabled spaces HAVE to be created for the busiest time that disabled people use a store. Their planning will have ascertained that level.
Just coz it's not the time you ( or I ) go doesn't mean there should be less.
DO like your idea to have an area which charges more for cars to be a little more protected. BUT, you will still get grandad in his Merc dinging your car with his trolley
and the inevitable Beemer baby breeder scraping in the way in and letting her kids stick chocolate covered hands over your beloved vehicle
Now, if you DO it then how angry will you get when there are no spaces left there ? Coz it will happen and then when you go in the runabout and don't want to pay extra you'll no doubt complain about all the empty pimp-mobile spaces as well as the empty child and disabled ones
"A woman without curves is like a road without bends, you might get to your destination quicker but the ride is boring as hell'