Meaning no disrespect for Rabbi Miller, I doubt he has ever driven in a very nice car, or ever owned one.
While the cost of maintaining a car is immense (I just did a cash flow analysis and I am putting a good deal into car costs, including car payment, insurance, gas, and monthly maintenance) the pleasure gained from driving a nice vehicle is commensurate. I have been going through a lot of mental processes trying to justify the cost of such a nice car, and it boils down to an axiom my father told me when I first moved in to live with him in Los Angeles.
"If you are going to work hard you may as well enjoy the ride in the car to work" and "It's not what you know, but what you drive, in Los Angeles".
I testify that when I drove my last car I would constantly (several times a week) receive compliments and blessings from people walking by as I was filling up with gas, or parking at a shopping center.
It is because of this that I often think of the "Ayin Hara" and I make sure to thank and bless anyone who compliments or blesses me.