Who is it that is arguing that Macs aren't more expensive? That's the beautiful thing about a free market economy, people can spend their money on what they WANT. If you don't WANT to pay the price for a Mac, then don't buy one. If you are okay with it and like the OS, then buy one. The argument that we should bash Macs because they are more expensive is simply old, overplayed, has already been acknowledged as a general rule of thumb, and in some cases isn't true. If you can put together a better computer for less money and run an OS (legally) that you want then just do it, leave the other people alone who are willing to pay the "Apple tax".
There is some research that states (http://news.cnet.com/2100-1040-943519.html) that Mac users are better educated and make more money. No one brings that up over and over again.
I personally use both, for different tasks. I love both, for different reasons. I do hate Vista however, I stuck with XP, 7 show promise, but so does Snow Leopard. The ridiculous part seems to be that almost everyone here has given into the "this one is better" marketing, and allowing Microsoft and Apple to play you all off each other. Just like what you like, use what you like best and let the other people be. Let them make their own decision, its okay, its not some kind of moral dilemma. Its a computer, that at the end of the day essentially does the same thing a somewhat different way. Let it go on this on.