Apple has the monopoly. Where else will you find well-built computers running OS X (Unless you're one of the few who can actually build and maintain a hackintosh)? Nowhere, so Apple are the price makers. At the end of the day, there really is not much reason for them to price competitively in relation to the PC market. I mean PC's don't really compete with Macs performance-wise (Not saying ones better, just saying they each perform differently), so why should they compete on price. With Macs, you're getting a unique experience not found anywhere else and if you want it, you have to pay extra.
This was the argument that psystar used about apple having a monopoly. They lost the argument, as apple compete with pc's running windows and Linux.
On that basis then iPhones and iPads are monopolies as well as they are the only phones and tablets running iOS.
You buy what meets your own personal needs.