CNBC cites 2017 data from Costco: In 2017, the most recent year Costco has data for, the average household income of the Costco member was $92,236. https://ww

CNBC cites 2017 data from Costco: In 2017, the most recent year Costco has data for, the average household income of the Costco member was $92,236. https://www.cnbc.com/2019/05/22/hooked-how-costco-turns-customers-into-fanatics.html https://www.cnbc.com/2019/05/22/hooked-how-costco-turns-cust... Regardless of your threshold for reliability, I would be much more interested in anything that demonstrates your claim that Costco is "a cross section of society from all income levels".