Hmmm....I've trailered boats, motorcycles, watercraft, off-road vehicles, hardware, lawn care equipment, moving boxes and yes, even cars, but I've yet to trailor anything.
This is typical at bike week Daytona and of course the huge Harley gathering each year, people truck or trailer their bikes to the location to ride them for 20-30 miles over a few day span. I don't get it.
That said I don't know anyone who treats their benz like a garage queen. I know some folks who own multiple cars and the benz being the best, it gets the garage, but beyond that, it's driven regularly as well.
And all that said, why get your undies in a knot about it? Live and let live, drive and let park; they paid for the car, they insure it, they care for it, they should be permitted to use it (or not use it) as they see fit.
Take care and enjoy the ride,