Can't put my finger on what it is that caught me, or even when I first encountered my first AS. I guess for me, they've just always existed.
I bought our '63 GT on the internet last month without having ever been inside one. SilverTwinkie graciously let me tour his before we went to pick it up, but I don't know what I'd have done if I realized then and there that I hated the thing!
I can say as a Macintosh user that I enjoy being part of a small, dedicated group of people that enjoy items of substance - well-thought out, well-designed, well-built things that are specific enough to become benchmarks for a whole category, but useful enough to fit a diverse set of needs.
I will admit this (and perhaps this will make me look like an attention-getter, but I don't think I am): my serious interest in Airstreams probably wouldn't have accelerated to the point of buying our Globe Trotter if everyone on the block had one in their driveway. There's something about the interaction (not quite the over-the-top stuff in QQQ's stories) that reinforces my enjoyment of it, and my admiration for a unique design that has survived the decades without becoming overdone, overused and overkill.
I also wouldn't have gotten bit by the aluminum bug if it weren't accessable to the common man. If you needed a Peterbilt to pull it, 3 different kinds of permits to work on it, and 6 zeroes in your bank account to enjoy it, it would lose all it's fun, and it's humble "attitude." It almost seems to exude humility as it sits, waiting quietly to take you someplace beautiful, doesn't it?
I think the mystique lies in a long history, a continued role in popular culture, a timeless design and simple construction.