To tell you the truth, neither do I any more. I care about computers as much as I care about telephones. They're necessary to what I do, but I couldn't care less who makes it or what it runs. As long as it works the same way every time I touch it. (So yes, that rules Windows almost completely out. I use Linux when I have a choice.)
If I thought I could have a single install that worked without updates for 10 years, and continue to do everything I want, I'd use it. If I were installing either a standalone application or something on a private network -- which I'm betting describes 90% of Andrew's clients -- I'd do the exact same thing, burn it to disk and store it somewhere.
If learning the install options for another distro makes me more money, saves me time, or improves my life, I'll do it. Otherwise, it's a waste of my time. And last I heard, they're not making any more of that.