I'm not familiar with QuicTrip, but Trader Joes is more expensive than most grocery stores, so the higher wages and better service comes with a price tag.
Costco Wholesale charges a membership fee, sells bulk-size items which they buy at wholesale rate, sell at closer to retail rate and guarantee quantity sales by product size.
So Trader Joes has a different customer base and market and Costco has a different business model and market.
Add on that you do get better productivity and can certainly be more profitable with higher wages if those wages are comparitavely higher than competitors..
Example: 5 grocery stores pay at or near minimum wage ($7.25/hr). Store 6 pays $12.00/hr. Potential workers are indifferent between stores 1-5 but are more interested in Store 6, which benefits from the competition of workers to get a job and can be more selective. Once a worker is in a job, if a worker in stores 1 is less than competent or takes a lot of time off and is fired, s/he can still find a job working the same salary at stores 2-5. Not so a worker at Store 6.
Henry Ford demonstrated all this a century ago when he cut absenteeism and increased productivity of workers by paying significantly above the average wage.
But again, that only works in comparison.
Walmart pays $7.25/hr. Their productivity and service is no greater than when they were paying $5.25/hr. Increasing wages only works if your competitors don't (or you have a market niche).
Costco's average pay, for example, is $17 an hour, 42 percent higher than its fiercest rival, Sam's Club (owned by the Walton family, which owns Wal-Mart). And Costco's health plan makes those at many other retailers look Scroogish. Costco's workers pay just 8 percent of their health care costs, when the retail average is 25 percent.
[Wal-Mart workers, meanwhile, make around $8.75 an hour about $18,000 a year. Wal-Mart Stores Inc's just announced that U.S. employees will pay between 8 and 36 percent more in premiums for its medical coverage in 2013, prompting some of the 1.4 million workers at the nation's largest private employer to say they will forego coverage altogether. - Source: Reuters]
Costco's stock price has risen more than 10 percent in the last 12 months, while Wal-Mart's has slipped 5 percent. Costco shares sell for almost 23 times expected earnings; at Wal-Mart the multiple is about 19. Mr. Dreher said Costco's share price was so high because so many people love the company. "It's a cult stock," he said.
Despite Costco's impressive record, Jim Sinegal's (chief executive of Costco) salary is just $350,000, although he also received a $200,000 bonus last year. That puts him at less than 10 percent of many other chief executives, though Costco ranks 29th in revenue among all American companies.
[S. Robson Walton, Wal-Mart chairman, has a net worth of about $19.7 billion . And he's only number 9 on the list of 2010's top 20 richest Americans.]
Costco also has not shut out unions, as some of its rivals have. The Teamsters union, for example, represents 14,000 of Costco's 113,000 employees. "They gave us the best agreement of any retailer in the country," said Rome Aloise, the union's chief negotiator with Costco. The contract guarantees employees at least 25 hours of work a week, he said, and requires that at least half of a store's workers be full time.
[No Wal-Mart stores in the US are unionized.]