Well at a certain point, cars become luxury goods...depreciating ones at that. Many smart people with long money often aren't even spending their own money on luxury cars, they are corporate leases. Besides, you don't always necessarily need a lot of money to get a mid sized luxury car. Recent year used ones can be bought for under 30k, and even then, most Americans are buying cars that are over half their income anyway. All you need is decent credit to spend beyond your means.
With that said, if you are aware you are throwing money away at something usable, you want, and can afford to do so - that's ok. It's just like spending money on expensive clothes, an appliance, or any depreciating capital. It's a tangible asset that you can get salvage value from...I like cars, I'm guilty of it.
This thread shouldn't be trying to shame people, maybe it would come off better if it was more informative for people looking for financial advice.