Costco and the minimum wage

Speaking strictly from personal experience here...Re: Costco and their workers high wages. Great for them! It's a good store! I just have to search longer to find a worker to help me than I do at Sam's Club, because there are fewer of them. Also unlike Sam's Club, the workers giving out samples at Costco work for a different company & don't know where anything in the store is. Wonder what their pay is like?