Nobody should begrudge your right to use Windows, even if we have a different personal preference. However it is fair to question the wisdom of installing windows on a Mac if that is your preferred OS. There are dozens of great laptops that run windows, most selling for fare less than the Apple equivalent.

If I had any desire to run Windows I would be happy to save a lot of $$ and just purchase a Windows system. There is nothing special or unique about Macbook Air except that it is easy to use right out of the box, which I have yet to find with any Windows product (or most non-Apple products of any kind).

You've already gotten 2 years out of a product with an average lifecyle of 3 years, so you simply be accelerating your next purchase by a year or so. And I'd be happy to step up and buy your current unit as my Macbook is 6 years old and thus well beyond the expected obsolecense cycle.