It has nothing to do with impressing girls or anyone else. It's a personal preference. I'm particular; I like for my things to look a certain way. All of us have our own proclivities, so why don't we all just shut the hell up about this already? How does it harm Matt Maroon if I "spend too much" for an Apple product? Just tell yourself that I'm a moron and move on.
Elegance begets elegance. For me, it's a lot easier to write good code when my surroundings are to my liking. It's the same reason why I set the desktop as I like it, wear comfortable headphones, and keep my system well organized and "clean."
Given that I typically spend at least 10 hours a day on my computer and use it to make my living, I consider it worth a few extra hundred dollars amortized over the life of the machine to make my life that much more pleasant.
I've never understood why some people are so puzzled or, worse, offended by that idea.