Apple's stuff have fixed prices. Not a good fit for Costco.
Sam's Club is a competitor to Costco though, and they've got a huge supply of Apple products. So I don't see how that logic works here. Something else had to have happened here.
Apple needed Costco far, far less than Costco needs Apple.
Huh? I HIGHLY doubt Costco was a big driving force behind Apple's huge success over the past decade.