Apparently, Costco is universally loved by all tax brackets.

"Of course, they own a lot of expensive things like furniture, makeup, clothes, and use our service as many times as they want, or go to events whenever they want. I know that not all rich people are like this, but this is what I noticed about my clients."

"Reading a lot of comments here about people seeing their rich neighbor at Costco. However, I assume that OP’s question referred to the ultra wealthy, and in that case, I believe most of their products are the most refined and quality-manufactured products in the world, and certainly not sold at Costco."

"If it sat in the fridge for three days, it goes in the garbage if they didn’t use it. They want everything to be fresh and perfect. There is no thought process when buying groceries for them because even if they paid 500% more for things, it is a pittance to them."

"I’d go to Costco and buy toilet paper for 10 bathrooms, stock the wine fridge in 5 different rooms, or put away and organize all the online purchases, run to a bookstore, Starbucks, Pete’s, set up an interview for a driver, arrange for a new car to be delivered (just one time) stock up on tampons, arrange flights or PJs for them or family or other people that worked for them. If I saw a need for something, say, the front step had started to crack, I’d be the one taking pics, calling around for quotes, and arranging with the security company to expect these companies on these days and let them in the gate.

My favorite family had a light bulb closet. Once a month or so, I was tasked with walking the house and noting ALL of the bulbs to organize, stock, and label a closet with just light bulbs."

Note: Some responses have been edited for length and/or clarity.