The cost of a Ferrari isn't in the car. It's in the insurance, maintenance, and stress of anything happening to the car. I for one would hate to have a luxury vehicle even if I could afford it and even if you guaranteed to buy it back from me for the same amount I'd get investing in the stock market.
Yeah, I feel like I could (should?) get around town faster in a beat up Corolla, and getting around faster on a highway in a supercar would require taking a lot of physical + legal risk.