If that's the case, then the fuss ought to be about the qualifying criteria for higher rate PIP, and not what an individual in receipt of it choses to do surely? At that point, whether the £77 is spent on a Citroen, a BMW, a Mercedes or a Land Rover is irrelevant to the Government and the taxpayer.
I am bemused by how Motability became the target of so much hatred by those on the left and in this Government. The Government says it wants to reform welfare, but to date has just ballooned an imagined £1b billon black hole into an actual £70billion one.
Motability is not that complex a set-up. It works because of guaranteed (as in no credit risk) income from the Government, the VAT exemption for the disabled and economies of scale - it buys and maintains a huge fleet.
To reduce the number of Motability cars you simply need to review the qualifying criteria for higher rate PIP and review the VAT exemption. Limit higher rate PIP to those with physical disabilities, and limit the VAT exemption to modified vehicles, and the numbers would look very different.
Personally I would still let Motability receive payment direct from the Government, because some of those in receipt of it would struggle to pass a credit check for leasing. I would also let Motability lease cars to those in receipt of higher rate PIP but that did not need a modified vehicle. But if all non modified vehicles were removed from the VAT exemption their cost would go up on the scheme anyway, making the 'luxury' cars less attractive.
My solution would protect the benefit to those who need a modified vehicle, make leasing a car accessible to those in receipt of PIP but who don't work or who can't otherwise get credit, increase VAT income to HMRC and it would reduce the cost of higher rate PIP to DWP.
It's what I think is called a joined up approach. One might almost say a policy... Alternatively, you can whip up a frenzy about Jeff with his leased Mercedes EQA that his neighbour's aunt's cat told you is used by his grandson to deliver pizza, but not actually save any money and worse, negatively impacting those in genuine need.