See, it was an enlightening debate, after all. Perhaps not the one I had in mind, but glad to have started it anyway :-)
FWIW, I ride singlespeed 'cos I don't like changing gear, don't like cleaning/maintaining gears and like the elegance of a simple design.
I don't subscribe to this 'my way's the best way' mentality so prevalent on forums, particularly when people get so agressive against the 'other side' which threatens their way of thinking (eg Mac v PC). If you're really sure that something is best for you then that's cool; who cares if people don't agree with you.
So, in summary, I don't have gears. Some other people do have gears. And I still like them (unless they're a tosser for other reasons).