Oh look, a batshit insane example that makes no sense. Apple's profit per employee is around half a million. Why? Because they farm sh*t out to foxcon, not because they pay apple store employees $12 an hour, or whatever it is poors that work there make.
Given that Sam's club and Costco are direct competitors, your quibble makes no sense. They are in the same business - and while they may be targeting slightly different demographics, the point stands. If I was comparing walmart to apple, you'd have a point, but I am not.
Costco pays it's employee's approx 70 per cent more than walmart/Sams does, yet gets almost twice the profit from each one of them. That's significant. It shows that there is a huge, underrated benefit in paying employees more (at least until a certain point) - as it results in decreased turnover, increased productivity and less shrinkage
Edited, Mar 14th 2013 3:36pm by Olorinus