I would assume that only the "pampered" cars would be parked in a carpeted garage...the daily drivers would remain outside...
...saw an HGTV program entitled "Extreme Garages"...unbelievable stuff! Many owners had separate garage buildings...one, a fully-equipped shop to work on their cars, and the other would house the vehicles in a "dealer showroom" type of design.
They saved the best for last. The owner had a subterranean garage built under his backyard (his already lavish backyard landscape had to be dug up and redone after it was finished)!
He had several beautiful antique vehicles, but the "piece-de-resistance" was a 1930-something French Delanye (one of two ever in existence) on a rotating turntable with custom lighting. The turntable surface was painstakenly machined in engine-turned design (like the front cowling on Charles Lindbergh's famed "Spirit of St. Louis plane)! Many display cabinets and shelves displaying automotive paraphernalia, a huge wet bar and home theater included...it rivaled any auto museum I had ever visited!!! And all this under an already lavish mansion estate!
I will have to settle for latex paint on the walls, some wall prints, my show plaques and the aggregate coating...and the least I'll have the "floor-de-resistance"...