When you're not paying for it then it makes the choice pretty simple. See all the threads about student loans and paying them back.
I agree that apple currently has the upper hand in laptops right now. Aside from the high end business class, there aren't many windows based products with great build quality. Now that technology advances seem to be slowing down for laptops it is easier to justify keeping one for more than 3-4 years. Also, the crap that is Windows 8 will only help Apple until people migrate to Linux.
Im going to go on record saying the people will never NEVER migrate to linux. Ever. If I am found wrong, feel free to call me back on this. If anything, the desktop platform will be gone altogether and the mobile OS will be on all devices. Much like almost all of them are wanting to do now.