As a PA for people with disabilities I have no issue with a disabled person having any kind of mobility car, luxury or otherwise, many need one but I do have an issue with family members using these cars for their own use.
The last family I worked for had an adult daughter with disabilities, she lived independently from them. They kept the mobility car at their house, fair enough as they would regularly visit her and take her out but the rest of the time they saw the car as their own and this was the reason they keep it at their home. It even had two child seats in the back because they ferry their grandchildren about and the dad was a carpenter and often used it for work.
And another example, my parent's neighbour's wife has a mobility car but the husband (who has no disabilities) uses it to go fishing and golfing in. I often see him loading it up and off he goes, alone, without his wife who's car it is actually registered under.
I often do wonder how many other family members use mobility cars for their own needs?