Washers, dryers, water heaters, and dishwashers are luxuries. So are heat and air conditioning. These are the household luxuries I would miss most if everything went to hell. Also, cars. Any car is a luxury. Remember how bad it felt the first time your car broke down and you had to walk? I drive a 10-year-old Ford, and I could replace it today if I felt like it, but I couldn't be happier if it were a Bentley. I thank God for it every time I drive it.
I think my first big extravagance was a $2200 used lathe. My first machine tool. I bought it from a company called Plaza Machinery, run by a now-dead man named Joe Bergamo. He turned out to be a disgusting swindler. Sent me the wrong machine with the wrong motor, and it had much more wear on it than he claimed. He wouldn't take credit cards, and I found out why. Never buy anything over the web if they won't take a card. There is only ONE reason for that policy, and it's to allow sellers to cheat people.
Not long afterward, I bought a Chaiwanese (Taiwan parts assembled in China) Bridgeport clone, and I spent over $12,000 on a 4-ton Taiwan lathe. Both new. I stuck them in a little two-car garage. I have never regretted it.
Another luxury: when my wife got her green card, I brought her here via business class. She goes on and on about it, even today.