This isn't controversial. Macs are more expensive because, in the market of those who are already dead set on getting a Mac, there is zero competition.
Wow, such a fail comment. How do you become dead set on getting a Mac? Oh right, you look at the PC market first. You look at the options there and then decide that the cost/benefit of getting a Mac is suitable to your needs. You seriously don't consider that competition?
Or are you insinuating that only Mac fanboys buy Macs? If that is the case, how exactly is Apple growing their market share?