Commissario
Because as has been said, you probably don't absolutely rely on your car for the most simple trips out?
Nor, I'm guessing do you have any impairment that means you can't fit into any/all cars?
I can fit into an old style mini (barely) if need be, likewise I can get into most any car that can physically fit a 6'2" body, and it's not the end of the world (or potentially life threatening) if it breaks down.
My mother, is shorter than me, but stuggles a lot to get into many standard cars because of hip issues (multiple ops that have all failed), as an example.
However you try getting someone with a wheelchair into many cars, especially if you're expecting the one vehicle to be both suitable for someone with a disability, and for normal family life - seriously, try getting just a manual wheelchair into many cars, then consider how hard it could be for someone with back/hip/leg issues to get into many cars (either due to height, door opening size or other basic consideration), before you even take into account that many disabled people that do drive require auto's or modifications that either limit the choice of vehicles that are suitable, or raise the price.
I'll also say, once again, you don't own a motorbility car, you lease it with it taking your Disability Living Allowance, Mobility component (higher rate), plus any necessary upfront additional payments.
It's basically a lease/hire scheme that is tailored for people with disabilities to let them get reliable cars that are suitable for them (and the easiest way to do that, is to offer a wide range).
It does it a Zero extra cost to the government over and above the Mobility Allowance (which you can get regardless of if you use it for a Motorbility car or not) in most cases*, because:
A: It's restricted in the people it offers the cars to.
B: It's non profit - any money made is put back into it rather than paying off shareholders.
C: It's a big scheme, which means it can get the cars for much less than "book" a lot of the time.
D: Many of the car manufacturers work hard to get cars into the scheme as it does them good in terms of sales figures, PR and advertising (and the theoretical requirements for a dealer to be an official Motorbility approved dealership require they have specifically trained and named contacts as well as guaranteed loan cars/pickup/dropoff for cars that are being services etc** from memory).
*I believe there are specific government funds available to adapt vehicles where there is a major medical/occupational health need and no suitable vehicle (IE where you might need a tail lift or hand controls).
**I vaguely remember when my mother had a car under the scheme the local dealership were willing to get a suitable loan car in from another dealer if needed.
