Macintosh caters directly to the people who are technologically blind. Yes, they make great media computers, that have great software capable of making great finished products. But they rely solely on people who aren't knowledgeable about computers to make their profits.
They seem to directly relate screen size to cost.
In another thread, I compared the 'top end' '27 inch' iMac and was able to build an equally powered computer on Newegg for under half the price. With the same size monitor. Then you've got to remember, for example, if you're a graphic designer like me, you've still got to buy your Photoshop and CorelDRAW. You could use that extra $1600 you save by getting an equivalent PC on better programs for producing.
With a Macintosh, all you really are getting is a media computer. There aren't really any other defining features to choose it over a PC. It can't game well. So as well as saving money, you've bought a computer that can do more. Is more compatible. Can be upgradable.
All in all, Macs are really good at what they do, but that's all they do. They don't do it so much better that it will justify the extra cost and compromises you have to make.