What monopoly?
I'm an educated as an Economist, DHS, and Apple does not have a Monopoly on anything it sells, except Apple products. There is no monopoly that can force prices of Apple products upwards against the Economic Law of Supply and Demand against the will of the willing buyers, Apple's customers, which are the computer and mobile device buying public. There are alternative source computers and mobile devices in both markets at equal and lower price points that consumers can purchase, should they choose. The willing buyers of Apple products are thronging in millions to Apple Stores to buy at Apple's retail list price, without even asking for a discount or "sale" price, because the value is of the purchase is worth it to them.
Ergo, the Apple products are not "overpriced" and in fact may be underpriced because Apple has never bothered testing for price resistance, the price point beyond which the consumers find the product not of value to purchase. Other computer and mobile device makers know theirs resistance levels, because to keep selling, they are forced to deeply discount their products below their resistance Levels, and then some to move them out of inventory!
That is why we don't have a single Apple computer in our business of 150 plus computers. Even our servers are PC based (HP and Dell). I suspect that most businesses are the same. The cost premium demanded by Apple simply isn't worth it.
Someone mentioned that Apple is the Lamborghini of computers and the PC is the Ford or Chevy. This was a perfect analogy. Most people would like an expensive Italian sports car. Heck, I might even test drive one. But I will never buy one. Same for Apple and for me and probably most people. So the people in the Apple store are probably just looky loos or buying music players.