Anyone can own pretty much any car they want, that's the nature of car ownership now. But when you're talking about brands, Audi still lag a very long way behind the others.
As an example; when I ask for a car from an airport or a hotel, I expect an S Class. If it's a 7 Series I don't mind but would prefer a Merc. I know plenty of people who are happy with XJs, but I don't particularly like sitting in the back of one. Happy with the brand though.
If the driver turns up in an A8, I don't use that company again (or if the hotel has booked it I remind them what I expect of them). As much as they wish they were, Audi are just not a premium brand. They're Hugo Boss in a world of Gucci and Dior. They're the car chavs buy when they want people to think they drive an up-market car.