Respecting the second part of your comment, I’ve been impressed that the Linux-on-Mac community was so big, I didn’t know about it! So, if running a Linux on a Mac is so easy and you can find better support than on another laptops, then it makes sense to me.

What a pity that Apple doesn’t sell virgin MacBooks without Leopard :)

[1] http://catux.org/fotos/index.php?list=16

I will tell you why I bought my macbook pro, and it is because I find that the apple-linux community is huge compared to others thus you can find more support. The fact that there’s only a few choices MacBook Pro or non-pro and just about 4 types of them, makes it easier to find help on an specific laptop, a thing that didn’t happen when I had my vaio, manily because there are just too many “series” and each one has another number to identify the computer and then another letter and so on … it was impossible to make my FN keys work for at least a year and it certainly wasn’t easy to install afterwards. The fn keys on my macbook pro worked from the first day, just had to install pommed from the repositories!
Those are just a few of my motivations, as you can see some of them aren’t big choices, but you can always think that at least, your computer appears on TV each day :D (Dell’s also do, but not the laptops :P)