I thought I voted to put a hold on this for- but others beat me to the punch. My initial thinking combines two reasons we close questions:
Asking about how Apple does it's business isn't the core function for the site. We want to be a place to learn how to use Apple's products. If there were a site on how to read financial disclosures or how to find the best paid estimates of sales figures that simply don't get released - perhaps your question would be an awesome one for that site. Boiling down your question - it's not really about using iPod or any other product that Apple sells. It's more meta than that.
It's also primarily opinion based. You could ask a yes/no question. Does Apple report sales volume for iPod products? Some would answer yes, some would answer no. There's not much value to a question like that IMO - but it at least would have some answers people could vote on and you could select one.
I chosewould also have chosen the former close reason since it asks you explicitly to show some research. Maybe you're a developer looking to do market analysis. Maybe you're asking about X since you think it will answer a related question Y that might be a better fit for the site.