Sorry, you are completely incorrect here. This comparison has been done to death on the web now: a Macbook and a PC notebook with the same build quality and hardware are about the same price these days.
In fact, I have a Mac Mini running Windows. It sits in my home theater system and basically does nothing but run 2 Minecraft servers and occasionally show streaming video on my TV. Up until the Intel NUC came out, I literally could not build a real PC that size. (Yes, there are Atom and Celeron micro-PC's, but those hardly count.) In fact, I recently worked with a government agency that bought several Mac Mini's to deploy in their mobile command posts - specifically because they ARE small and can run WIndows. Those machines don't even have MacOS on the hard drive; they're just little, compact PC's.
And the iMac is probably the world's finest all-in-one PC. When you compare other All-in-one systems, you quickly find that the prices are not out of line with the hardware that's packed inside.
Sure, you can get a PC notebook for $400, and you can't buy a Macbook for less than $1000...but that $400 notebook can't do what even the cheapest Mac can do, and when you compare similar hardware, Macs are not significantly more expensive than PC's.